Selected Morbidity Data for Publicly Funded Hospitals

Selected Morbidity Data for Publicly Funded Hospitals

Selected morbidity data for publicly funded hospitals

1 July 2003 to 30 June 2004:

Summary Tables

New Zealand Health Information Service 2007

Copyright


Contents

Copyright

Contents

List of tables and figures

Introduction

Statistical coverage

Data source

Terms

Symbols used

Summary tables

Appendix

Population data changes

Calculations

Segi’s world population

Ethnicity

Additional information available

Glossary

List of tables and figures

Table 1: Publicly funded hospital discharges, inpatient and day patient numbers, 2003/04

Table 2: Publicly Funded hospital discharges by age, sex and ethnicity, 2003/04

Table 3: Inpatient mean length of stay by sex andethnicity, 2003/04

Table 4: Publicly funded discharges from hospitals, percentage by age group, 1995/96–2003/04

Figure 1: Publicly funded discharges from hospitals, percentage by age group, 1995/96–2003/04

Table 5: Discharges from public hospitals, age specific and age-standardized rates,1995/96 – 2003/04*

Figure 2: Age-specific hospitalization rates per 100,000 by age, 1995/96–2003/04

Figure 3: Causes of injury and poisoning - public hospital discharges, total population, 2003/04

Figure 4: Causes of injury and poisoning - public hospital discharges, Māori population, 2003/04

Figure 5: Causes of injury and poisoning - public hospital discharges, Pacific Peoples population, 2003/04

Table 6: Injury and poisoning, inpatient mean stay and bed days by sex and ethnicity, 2003/04

Table 7: Public hospital discharges involving injury or poisoning, total population, 2003/04

Table 8: Public hospital discharges involving injury or poisoning, Māori population, 2003/04

Table 9: Public hospital discharges involving injury or poisoning, Pacific Peoples population, 2003/04

Table 10: Hospital discharges involving intentional self-harm, by sex and ethnicity, percentages and numbers 2003/04

Table 11: Hospital discharges involving intentional self-harm by sex, numbers and age-specific rates per 100,000 population, 2003/04

Table 12: Mean length of stay for discharges involving intentional self-harm by sex and ethnicity, 2003/04

Table 13: Youth hospitalizations for intentional self-harm by sex and ethnicity, numbers 2003/04

Introduction

Statistical coverage

The statistics in this report refer to inpatient and day patient public hospital discharges from 1 July 2003 to 30 June 2004. Information about patients treated in private hospitals under publicly funded contracts is also included. Patient discharge details for licensed rest homes are excluded from this report.

Data source

The data for this report are drawn directly from the National Minimum Dataset (NMDS). No filtering has been carried out in the production of this publication. Consequently, if hospitals differ in their interpretation of the guidelines for reporting data to the NMDS, no adjustment for this has been made to the data presented in this report.

Data held by the NMDS and reported on in this publication may vary over time as historical records are updated. Please refer to the Analytical Services team of the New Zealand Health Information Service for validation of current data.

Analytical Services
Business Intelligence Unit
New Zealand Health Information Service
Ministry of Health
PO Box 5013
Wellington
New Zealand / Telephone: (04) 922 1800
Fax: (04) 922 1899
E-mail:

Terms

Coding standards

In July 1995, the New Zealand Health Information Service adopted the Australian Version of the International Classification of Diseases (Clinical Modification) (ICD–9 CM–A) and the Australian National Coding Standards. This resulted in a change to classification of procedures and discharges. Due to delays in the standards being uniformly interpreted across all reporting hospitals, some figures from the 1995/96, 1996/97, 1997/98, and 1998/99 public hospital publications may not be comparable with each other or with earlier years. For further information on changes to classifications of discharges and procedures, see the earlier Selected Morbidity Data for Publicly Funded Hospitals 1995/96, 1996/97, 1999/00 publications.

Between the 1 October 1998 and 31 March 1999, the International Statistical Classification of Diseases, 10th Revision, Australian Modification, 1st Edition (ICD–10 AM) was introduced to code hospital discharges and procedures. ICD–10 AM was superseded in July 2001 by the International Statistical Classification of Diseases, 10th Revision, Australian Modification, 2nd Edition. This method of coding discharges and procedures replaced the ICD–9 AM used in previous publications. Due to this coding change, some figures from previous public hospital discharge publications may not be comparable with the data reported in this publication. For example, one area affected by the coding change is the coding of external causes of morbidity and mortality.

Discharges involving injury and poisoning

This publication reports on principal diagnoses. If this condition was the result of an injury or poisoning, an injury code describing the circumstances of the injury or poisoning is also recorded. This publication presents information on the first reported injury code only.

In some circumstances, the published injury code relates to a secondary diagnosis. This will occur when the secondary condition arose during the stay in hospital as the result of an external cause (for example, complication of surgery or medication) and the principal diagnosis is not the result of an external injury or poisoning.

Healthy newborn babies

The requirement to admit healthy newborn babies and submit data relating to them came with the signing of the 1991/1992 contracts between the then Department of Health and Area Health Boards. Before this, newborns were only treated as admissions if they were ill or otherwise required a level of care in excess of that given to a normal healthy newborn infant. Healthy newborn babies have been gradually included in hospital records since then, with all newborn babies included by 1 January 1994.

Psychiatric Hospitals

The number of hospital discharges referred to in this report includes those patients discharged from psychiatric hospitals (Facility type–03). The majority of these discharges are in Chapter V – Mental, Behavioural Disorders (F00–F99) of the ICD–10 AM categories.

Classification of public hospital deaths and discharges

The number of hospital discharges referred to in this report includes patients who were re-admitted for the same condition and patients who were transferred to other hospitals or residential institutions. Thus, there may be more than one discharge per immediate 'episode' of illness. Discharge figures also include any patients who die in hospital after formal admission.

Classification of day patients

Before 1986, when a patient was discharged the same day that they were admitted, the length of stay was recorded as one day. Since 1986, these patients are now recorded as a stay of zero days.

Before 1988, there was no requirement for hospitals to report patients who were discharged on the day that they were admitted, where the intention had been for the discharge to be on the same day as the admission. There is no fixed date for the commencement of collection of these cases, and different hospitals commenced reporting at different times. By 1992, all were being reported.

The increase in day patients shown in the following table is partly due to the opening of new units especially for day patients, and partly to hospitals gradually including patients from existing day units in the data submitted. It also reflects advances in medical technology facilitating more day surgery and day patient diagnostic procedures.

Day patient discharges from publicly funded hospitals, 1989-2003/04

Year / Male / Female / Total
2003/04 / 125,428 / 139,890 / 265,318
2002/03 / 122,185 / 135,045 / 257,230
2001/02 / 117,539 / 132,615 / 250,154
2000/01 / 108,828 / 127,251 / 236,079
1999/00 / 94,824 / 112,820 / 207,644
1998/99 / 86,354 / 103,081 / 189,435
1997/98 / 77,729 / 95,481 / 173,210
1996/97 / 67,511 / 84,825 / 152,336
1995/96 / 62,606 / 79,627 / 142,233
1995 / 58,896 / 75,268 / 134,164
1994 / 64,714 / 79,603 / 144,317
1993 / 57,249 / 70,297 / 127,546
1992 / 47,177 / 62,822 / 109,999
1991 / 35,824 / 51,750 / 87,574
1990 / 28,668 / 42,349 / 71,017
1989 / 22,338 / 34,386 / 56,724

Ethnicity

NMDS records up to three different ethnicities, and for ease of analysis the multiple ethnic groups recorded for individuals are prioritised to one ethnic group. See the Appendix for details of the prioritisation process.

Symbols used

The interpretation of the symbols used throughout this publication is as follows:

.. = figures not available

... = calculation of rates not applicable

Summary tables

Table 1: Publicly funded hospital discharges, inpatient and day patient numbers,2003/04

Sex / Inpatient / Day Case / Total
Number / % / Number / % / Number
Non-Māori, non-Pacific Peoples / Male / 193,648 / 67.2 / 94,711 / 32.8 / 288,359
Female / 257,507 / 71.1 / 104,831 / 28.9 / 362,338
Total / 451,155 / 69.3 / 199,542 / 30.7 / 650,697
Māori / Male / 37,625 / 62.0 / 23,040 / 38.0 / 60,665
Female / 52,275 / 67.1 / 25,631 / 32.9 / 77,906
Total / 89,900 / 64.9 / 48,671 / 35.1 / 138,571
Pacific Peoples / Male / 16,780 / 68.6 / 7677 / 31.4 / 24,457
Female / 22,907 / 70.8 / 9428 / 29.2 / 32,335
Total / 39,687 / 69.9 / 17,105 / 30.1 / 56,792
Total / Male / 248,053 / 66.4 / 125,428 / 33.6 / 373,481
Female / 332,689 / 70.4 / 139,890 / 29.6 / 472,579
Total / 580,742 / 68.6 / 265,318 / 31.4 / 846,060

Table 2: Publicly Funded hospital discharges by age, sex and ethnicity, 2003/04

Sex / Total discharges / Age group
0–14 / 15–24 / 25–44 / 45–64 / 65+
Non-Māori, non-Pacific Peoples / Male / 288,359 / 60,926 / 17,997 / 41,370 / 63,743 / 104,323
Female / 362,338 / 51,546 / 33,039 / 105,485 / 59,591 / 112,677
Total / 650,697 / 112,472 / 51,036 / 146,855 / 123,334 / 217,000
Māori / Male / 60,665 / 22,787 / 5538 / 10,771 / 13,943 / 7626
Female / 77,906 / 18,446 / 15,197 / 24,233 / 12,836 / 7194
Total / 138,571 / 41,233 / 20,735 / 35,004 / 26,779 / 14,820
Pacific Peoples / Male / 24,457 / 11,382 / 2115 / 4192 / 4130 / 2638
Female / 32,335 / 9163 / 5048 / 11,420 / 4001 / 2703
Total / 56,792 / 20,545 / 7163 / 15,612 / 8131 / 5341
Total / Male / 373,481 / 95,095 / 25,650 / 56,333 / 81,816 / 114,587
Female / 472,579 / 79,155 / 53,284 / 141,138 / 76,428 / 122,574
Total / 846,060 / 174,250 / 78,934 / 197,471 / 158,244 / 237,161

Table 3: Inpatient mean length of stay by sex andethnicity, 2003/04

Mean stay (days)
Male / Female / Total
Non-Māori non Pacific Peoples / 8.2 / 9.9 / 9.2
Pacific Peoples / 5.4 / 5.1 / 5.2
Māori / 6.1 / 4.2 / 5.0
Total / 7.7 / 8.7 / 8.3

Table 4: Publicly funded discharges from hospitals, percentage by age group,1995/96–2003/04

Sex / Age group
0–14 / 15–24 / 25–44 / 45–64 / 65+
1995/96 / Male / 31.4 / 7.4 / 14.8 / 18.1 / 28.3
Female / 18.7 / 13.9 / 32.2 / 13.0 / 22.1
Total / 24.1 / 11.1 / 24.8 / 15.2 / 24.8
1996/97 / Male / 29.9 / 7.1 / 15.2 / 18.7 / 29.1
Female / 18.2 / 13.2 / 32.1 / 13.4 / 23.2
Total / 23.2 / 10.6 / 24.8 / 15.6 / 25.7
1997/98 / Male / 29.3 / 6.7 / 15.3 / 19.1 / 29.6
Female / 18.0 / 12.4 / 31.9 / 14.0 / 23.6
Total / 22.9 / 10.0 / 24.7 / 16.2 / 26.2
1998/99 / Male / 28.6 / 6.5 / 15.0 / 19.5 / 30.4
Female / 17.7 / 11.8 / 31.3 / 14.4 / 24.8
Total / 22.5 / 9.5 / 24.2 / 16.6 / 27.2
1999/00 / Male / 28.0 / 6.4 / 14.9 / 19.6 / 31.1
Female / 17.4 / 11.3 / 31.0 / 14.8 / 25.5
Total / 22.0 / 9.2 / 24.0 / 16.9 / 27.9
2000/01 / Male / 26.8 / 6.7 / 15.6 / 20.4 / 30.4
Female / 17.0 / 11.5 / 30.7 / 15.4 / 25.4
Total / 21.3 / 9.4 / 24.1 / 17.6 / 27.6
2001/02 / Male / 25.8 / 7.0 / 16.1 / 21.1 / 30.0
Female / 17.0 / 11.3 / 30.3 / 15.9 / 25.5
Total / 20.9 / 9.4 / 24.0 / 18.2 / 27.5
2002/03 / Male / 25.7 / 6.9 / 15.7 / 21.3 / 30.4
Female / 16.8 / 11.3 / 30.1 / 16.0 / 25.8
Total / 20.7 / 9.3 / 23.7 / 18.4 / 27.8
2003/04 / Male / 25.5 / 6.9 / 15.1 / 21.9 / 30.7
Female / 16.7 / 11.3 / 29.9 / 16.2 / 25.9
Total / 20.6 / 9.3 / 23.3 / 18.7 / 28.0

Note: percentages do not sum to 100 due to rounding.

Figure 1: Publicly funded discharges from hospitals, percentage by age group, 1995/96–2003/04

Table 5: Discharges from public hospitals, age specific and age-standardised rates per 100,000 population,1995/96–2003/04*

Sex / Age-standardised rate / Age-specific rates
(Segi) / 0–14 / 15–24 / 25–44 / 45–64 / 65–74 / 75–84 / 85+
1995/96 / Male / 15,565 / 20,236 / 7294 / 7461 / 13,871 / 34,562 / 55,257 / 74,745
Female / 19,180 / 17,233 / 18,801 / 21,009 / 13,375 / 25,556 / 41,853 / 53,493
Total / 17,367 / 18,776 / 13,022 / 14,362 / 13,623 / 29,810 / 47,102 / 59,695
1996/97 / Male / 15,342 / 19,187 / 7106 / 7556 / 14,029 / 35,236 / 56,043 / 74,373
Female / 18,812 / 16,478 / 18,025 / 20,483 / 13,756 / 26,455 / 42,570 / 56,048
Total / 17,073 / 17,871 / 12,517 / 14,150 / 13,699 / 30,628 / 47,863 / 61,427
1997/98 / Male / 15,908 / 19,627 / 7142 / 7950 / 14,680 / 36,542 / 58,705 / 80,008
Female / 19,249 / 16,731 / 17,921 / 20,813 / 14,140 / 27,384 / 44,266 / 58,403
Total / 17,570 / 18,219 / 12,457 / 14,524 / 14,409 / 31,762 / 49,972 / 64,801
1998/99 / Male / 16,207 / 19,529 / 7315 / 8156 / 15,322 / 37,895 / 62,832 / 85,000
Female / 19,436 / 16,615 / 17,764 / 20,918 / 14,597 / 28,864 / 46,709 / 64,904
Total / 17,815 / 18,112 / 12,451 / 14,694 / 14,958 / 33,193 / 53,127 / 70,897
1999/00 / Male / 16,919 / 20,162 / 7616 / 8598 / 15,776 / 40,658 / 65,206 / 90,192
Female / 20,449 / 17,265 / 18,315 / 21,974 / 15,376 / 31,130 / 49,843 / 69,532
Total / 18,685 / 18,754 / 12,858 / 15,467 / 15,575 / 35,713 / 56,008 / 75,736
2000/01 / Male / 18,087 / 20,782 / 8685 / 9824 / 17,372 / 42,413 / 67,684 / 90,845
Female / 21,768 / 17,986 / 20,005 / 23,450 / 16,617 / 32,533 / 52,611 / 72,114
Total / 19,930 / 19,423 / 14,213 / 16,831 / 16,993 / 37,304 / 58,722 / 77,774
2001/02 / Male / 18,604 / 20,834 / 9403 / 10,510 / 18,086 / 42,078 / 67,444 / 95,388
Female / 21,843 / 18,198 / 19,555 / 23,317 / 16,837 / 32,338 / 52,575 / 73,103
Total / 20,236 / 19,551 / 14,424 / 17,118 / 17,455 / 37,030 / 58,681 / 79,770
2002/03 / Male / 18,443 / 20,846 / 8965 / 10,247 / 17,874 / 42,341 / 67,369 / 91,402
Female / 21,728 / 18,091 / 19,141 / 23,308 / 16,559 / 32,205 / 52,900 / 73,630
Total / 20,099 / 19,504 / 13,972 / 16,986 / 17,209 / 37,085 / 58,926 / 78,954
2003/04 / Male / 18,341 / 20,938 / 8649 / 9954 / 17,887 / 41,964 / 66,160 / 91,753
Female / 21,807 / 18,401 / 18,738 / 23,411 / 16,367 / 32,724 / 53,217 / 72,382
Total / 20,081 / 19,704 / 13,588 / 16,895 / 17,120 / 37,174 / 58,715 / 78,240

*Age-standardised toSegi’s world population. See Appendix for details.

Figure 2: Age-specific hospitalization rates per 100,000 by age, 1995/96–2003/04

Figure 3: Causes of injury and poisoning - public hospital discharges, total, 2003/04

Figure 4: Causes of injury and poisoning - public hospital discharges, Māori, 2003/04


Figure 5: Causes of injury and poisoning - public hospital discharges, Pacific Peoples, 2003/04

Table 6: Injury and poisoning, inpatient mean stay and bed days by sex and ethnicity, 2003/04

Mean stay (days)
Male / Female / Total
Non-Māori non-Pacific Peoples / 7.7 / 9.8 / 8.7
Māori / 6.6 / 5.9 / 6.3
Pacific Peoples / 6.4 / 7.8 / 6.9
Total / 7.5 / 9.3 / 8.3
Bed days
Male / Female / Total
Non-Māori non-Pacific Peoples / 351,743 / 435,715 / 787,458
Māori / 58,476 / 38,133 / 96,609
Pacific Peoples / 23,353 / 17,558 / 40,911
Total / 433,572 / 491,406 / 924,978

Table 7: Public hospital discharges involving injury or poisoning, total,2003/04

Circumstance of injury / Total number / Number of inpatients / Number of day patients
Total / Male / Female / Total / Male / Female / Total / Male / Female
Complications of medical and surgical care (Y40–Y84) / 46,372 / 22,261 / 24,111 / 41,314 / 19,747 / 21,567 / 5058 / 2514 / 2544
Falls (W00–W19) / 35,251 / 15,745 / 19,506 / 29,262 / 12,653 / 16,609 / 5989 / 3092 / 2897
Exposure to inanimate mechanical forces (W20–W49) / 14,090 / 10,347 / 3743 / 10,303 / 7725 / 2578 / 3787 / 2622 / 1165
Transport accidents (V01–V99) / 13,125 / 8384 / 4741 / 9940 / 6466 / 3474 / 3185 / 1918 / 1267
Intentional self-harm (X60–X84) / 5402 / 1744 / 3658 / 4008 / 1345 / 2663 / 1394 / 399 / 995
Assault (X85–Y09) / 4242 / 3243 / 999 / 2437 / 1905 / 532 / 1805 / 1338 / 467
Exposure to animate mechanical forces (W50–W64) / 3664 / 2395 / 1269 / 2788 / 1768 / 1020 / 876 / 627 / 249
Accidental exposure to other and unspecified factors (X58–X59) / 3458 / 1955 / 1503 / 2219 / 1216 / 1003 / 1239 / 739 / 500
Sequelae of external causes of morbidity and mortality (Y85–Y89) / 3602 / 2367 / 1235 / 2618 / 1719 / 899 / 984 / 648 / 336
Overexertion, travel and privation (X50–X57) / 3331 / 1841 / 1490 / 2317 / 1279 / 1038 / 1014 / 562 / 452
Accidental poisoning by and exposure to noxious substances (X40–X49) / 2294 / 1153 / 1141 / 1446 / 735 / 711 / 848 / 418 / 430
Contact with heat and hot substances (X10–X19) / 827 / 478 / 349 / 697 / 400 / 297 / 130 / 78 / 52
Other accidental threats to breathing (W75–W84) / 510 / 305 / 205 / 467 / 280 / 187 / 43 / 25 / 18
Exposure to smoke, fire and flames (X00–X09) / 415 / 317 / 98 / 344 / 265 / 79 / 71 / 52 / 19
Contact with venomous animals and plants (X20–X29) / 313 / 184 / 129 / 207 / 121 / 86 / 106 / 63 / 43
Supplementary factors related to causes of morbidity and mortality classified elsewhere (Y90–Y9) / 272 / 140 / 132 / 260 / 133 / 127 / 12 / 7 / 5
Event of undetermined intent (Y10–Y34) / 238 / 93 / 145 / 175 / 71 / 104 / 63 / 22 / 41
Exposure to forces of nature (X30–X39) / 169 / 88 / 81 / 128 / 67 / 61 / 41 / 21 / 20
Exposure to electric current, radiation and extreme ambient air temperature and pressure (W85–W99) / 132 / 104 / 28 / 83 / 64 / 19 / 49 / 40 / 9
Accidental drowning and submersion (W65–W74) / 107 / 68 / 39 / 94 / 59 / 35 / 13 / 9 / 4
Legal intervention and operations of war (Y35–Y36) / 55 / 49 / 6 / 39 / 36 / 3 / 16 / 13 / 3
Total / 137,869 / 73,261 / 64,608 / 111,145 / 58,054 / 53,092 / 26,723 / 15,207 / 11,516

Table 8: Public hospital discharges involving injury or poisoning, Māori, 2003/04

Circumstance of injury / Total number / No. of inpatients / No. of day patients
Total / Male / Female / Total / Male / Female / Total / Male / Female
Complications of medical and surgical care (Y40–Y84) / 5328 / 2432 / 2896 / 4775 / 2154 / 2621 / 553 / 278 / 275
Falls (W00–W19) / 3637 / 2120 / 1517 / 2795 / 1647 / 1148 / 842 / 473 / 369
Exposure to inanimate mechanical forces (W20–W49) / 2714 / 2008 / 706 / 2042 / 1538 / 504 / 672 / 470 / 202
Transport accidents (V01–V99) / 2275 / 1461 / 814 / 1728 / 1115 / 613 / 547 / 346 / 201
Assault (X85–Y09) / 1415 / 931 / 484 / 883 / 613 / 270 / 532 / 318 / 214
Exposure to animate mechanical forces (W50–W64) / 848 / 587 / 261 / 668 / 453 / 215 / 180 / 134 / 46
Intentional self-harm (X60–X84) / 797 / 319 / 478 / 605 / 252 / 353 / 192 / 67 / 125
Sequelae of external causes of morbidity and mortality (Y85–Y89) / 587 / 385 / 202 / 426 / 287 / 139 / 161 / 98 / 63
Overexertion, travel and privation (X50–X57) / 469 / 277 / 192 / 310 / 185 / 125 / 159 / 92 / 67
Accidental exposure to other and unspecified factors (X58–X59) / 454 / 272 / 182 / 296 / 179 / 117 / 158 / 93 / 65
Accidental poisoning by and exposure to noxious substances (X40–X49) / 407 / 196 / 211 / 264 / 136 / 128 / 143 / 60 / 83
Contact with heat and hot substances (X10–X19) / 225 / 121 / 104 / 195 / 105 / 90 / 30 / 16 / 14
Exposure to smoke, fire and flames (X00–X09) / 96 / 69 / 27 / 80 / 57 / 23 / 16 / 12 / 4
Other accidental threats to breathing (W75–W84) / 69 / 38 / 31 / 57 / 32 / 25 / 12 / 6 / 6
Contact with venomous animals and plants (X20–X29) / 67 / 37 / 30 / 51 / 29 / 22 / 16 / 8 / 8
Event of undetermined intent (Y10–Y34) / 44 / 17 / 27 / 38 / 16 / 22 / 6 / 1 / 5
Supplementary factors related to causes of morbidity and mortality classified elsewhere (Y90–Y9) / 33 / 17 / 16 / 32 / 17 / 15 / 1 / 0 / 1
Legal intervention and operations of war (Y35–Y36) / 29 / 25 / 4 / 19 / 18 / 1 / 10 / 7 / 3
Accidental drowning and submersion (W65–W74) / 26 / 18 / 8 / 22 / 15 / 7 / 4 / 3 / 1
Exposure to electric current, radiation and extreme ambient air temperature and pressure (W85–W99) / 24 / 20 / 4 / 16 / 14 / 2 / 8 / 6 / 2
Exposure to forces of nature (X30–X39) / 8 / 3 / 5 / 5 / 2 / 3 / 3 / 1 / 2
Total / 19,552 / 11,353 / 8199 / 15,307 / 8864 / 6443 / 4245 / 2489 / 1756

Table 9: Public hospital discharges involving injury or poisoning, Pacific Peoples, 2003/04

Circumstance of injury / Total number / No. of inpatients / No. of day patients
Total / Male / Female / Total / Male / Female / Total / Male / Female
Complications of medical and surgical care (Y40–Y84) / 2367 / 1174 / 1193 / 2116 / 1048 / 1068 / 251 / 126 / 125
Falls (W00–W19) / 1498 / 954 / 544 / 1074 / 689 / 385 / 424 / 265 / 159
Exposure to inanimate mechanical forces (W20–W49) / 1347 / 1001 / 346 / 942 / 715 / 227 / 405 / 286 / 119
Transport accidents (V01–V99) / 671 / 427 / 244 / 411 / 277 / 134 / 260 / 150 / 110
Assault (X85–Y09) / 500 / 378 / 122 / 314 / 252 / 62 / 186 / 126 / 60
Exposure to animate mechanical forces (W50–W64) / 336 / 247 / 89 / 234 / 159 / 75 / 102 / 88 / 14
Accidental exposure to other and unspecified factors (X58–X59) / 238 / 166 / 72 / 145 / 100 / 45 / 93 / 66 / 27
Overexertion, travel and privation (X50–X57) / 214 / 136 / 78 / 130 / 83 / 47 / 84 / 53 / 31
Sequelae of external causes of morbidity and mortality (Y85–Y89) / 210 / 150 / 60 / 167 / 117 / 50 / 43 / 33 / 10
Intentional self-harm (X60–X84) / 163 / 58 / 105 / 104 / 40 / 64 / 59 / 18 / 41
Accidental poisoning by and exposure to noxious substances (X40–X49) / 150 / 76 / 74 / 103 / 58 / 45 / 47 / 18 / 29
Contact with heat and hot substances (X10–X19) / 94 / 59 / 35 / 81 / 49 / 32 / 13 / 10 / 3
Other accidental threats to breathing (W75–W84) / 23 / 14 / 9 / 22 / 14 / 8 / 1 / 0 / 1
Exposure to smoke, fire and flames (X00–X09) / 21 / 17 / 4 / 16 / 12 / 4 / 5 / 5 / 0
Supplementary factors related to causes of morbidity and mortality classified elsewhere (Y90–Y9) / 9 / 4 / 5 / 8 / 3 / 5 / 1 / 1 / 0
Event of undetermined intent (Y10–Y34) / 8 / 3 / 5 / 4 / 0 / 4 / 4 / 3 / 1
Legal intervention and operations of war (Y35–Y36) / 7 / 7 / 0 / 5 / 5 / 0 / 2 / 2 / 0
Accidental drowning and submersion (W65–W74) / 5 / 2 / 3 / 4 / 1 / 3 / 1 / 1 / 0
Exposure to electric current, radiation and extreme ambient air temperature and pressure (W85–W99) / 4 / 3 / 1 / 3 / 2 / 1 / 1 / 1 / 0
Contact with venomous animals and plants (X20–X29) / 4 / 3 / 1 / 4 / 3 / 1 / 0 / 0 / 0
Exposure to forces of nature (X30–X39) / 4 / 4 / 0 / 2 / 2 / 0 / 2 / 2 / 0
Total / 7873 / 4883 / 2990 / 5889 / 3629 / 2260 / 1984 / 1254 / 730

Table 10: Hospital discharges involving intentional self-harm, by sex and ethnicity, percentages and numbers2003/04

Numbers and percentages
Male numbers / Male % / Female numbers / Female % / Total numbers
Non-Māori non-Pacific Peoples / 1367 / 30.8 / 3075 / 69.2 / 4442
Māori / 319 / 40.0 / 478 / 60.0 / 797
Pacific Peoples / 58 / 35.6 / 105 / 64.4 / 163
Total / 1744 / 32.3 / 3658 / 67.7 / 5402

Table 11: Hospital discharges involving intentional self-harm by sex, numbers andage-specific rates per 100,000 population, 2003/04

Number by age group / Age-specific rate by age group
5–14 / 15–24 / 25–44 / 45–64 / 65+ / 5–14 / 15–24 / 25–44 / 45–64 / 65+
Male / 25 / 454 / 868 / 339 / 58 / 8.0 / 153.1 / 153.4 / 74.1 / 27.3
Female / 129 / 1139 / 1684 / 607 / 99 / 44.0 / 400.5 / 279.3 / 130.0 / 36.9
Total / 154 / 1593 / 2552 / 946 / 157 / 25.5 / 274.2 / 218.3 / 102.3 / 32.6

Table 12: Mean length of stay for discharges involving intentional self-harm by sex and ethnicity, 2003/04

Mean stay (days)
Male / Female / Total
Non-Māori non-Pacific Peoples / 5.7 / 4.0 / 4.5
Māori / 5.9 / 2.7 / 4.5
Pacific Peoples / 7.8 / 1.6 / 3.8
Total / 5.8 / 3.7 / 4.4

Table 13: Youth hospitalisations for intentional self-harm by sex and ethnicity, numbers 2003/04

2003/04
Male / Female / Total
Non-Māori non-Pacific Peoples / 325 / 907 / 1232
Māori / 111 / 181 / 292
Pacific Peoples / 18 / 51 / 69
Total / 454 / 1139 / 1593

Appendix

Population data changes

In a major departure from historical practice, Statistics New Zealand now produces the national population estimates to relate to the resident population. Previously, both the national and sub-national estimates related to the de facto population concept, which included all people in New Zealand at a given time including overseas visitors and excluded New Zealanders temporarily overseas on census night. Statistics New Zealand has adopted the resident population concept to ensure that estimates reflect more accurately the population that resides in New Zealand.

The main outcome of using the resident population concept is that population estimates are slightly higher compared with the traditional de facto estimates, and the numerator is slightly smaller (since births, deaths, marriages, etc, registered to overseas visitors while in New Zealand are excluded). Consequently, demographic indices calculated using usually resident population as the denominator would be slightly lower, because a higher population and a lower numerator will result in lower rates.

In keeping with Statistics New Zealand, the populations used in this publication are estimated mean New Zealand resident populations. New Zealand Health Information Service has recalculated the rates published in the 1996/97 publication using the estimated mean resident population figures. For this reason, rate information in this publication will differ from the rate information published in earlier morbidity data publications.

Source: Demographic Trends 2000, Statistics New Zealand

Estimated mean New Zealand resident population at 31 December 2003, by sex and age, numbers

Age Group
(years) / Estimated Resident Population at 31 December 2003
Males / Females / Total
Under 5 / 143,580 / 137,130 / 280,710
5–9 / 150,150 / 141,480 / 291,630
10–14 / 160,440 / 151,550 / 311,990
15–19 / 152,330 / 145,220 / 297,550
20–24 / 144,230 / 139,150 / 283,370
25–29 / 123,880 / 128,600 / 252,480
30–34 / 141,080 / 153,920 / 294,990
35–39 / 146,590 / 157,130 / 303,710
40–44 / 154,400 / 163,210 / 317,610
45–49 / 138,760 / 142,860 / 281,620
50–54 / 123,390 / 125,190 / 248,570
55–59 / 109,500 / 110,960 / 220,450
60–64 / 85,760 / 87,940 / 173,700
65–69 / 67,060 / 70,800 / 137,860
70–74 / 57,260 / 63,030 / 120,290
75–79 / 45,150 / 55,460 / 100,610
80–84 / 26,960 / 42,280 / 69,230
85–89 / 11,710 / 24,290 / 36,000
90 and over / 4320 / 12,690 / 17,010
All Ages / 1,986,500 / 2,052,900 / 4,039,400

Source: Statistics New Zealand

Note: Individual figures in this table do not always sum to give the stated totals due to rounding

Calculations

Throughout this publication, percentages for totals may not sum to 100. This is due to rounding and is shown on each table where this applies.

Hospitalisation rates

There are two main ways of calculating hospitalisation rates:

  1. Age-specific hospitalisation rates.

Age-specific hospitalisation rates are the number of discharges in relation to the population size of a particular age group. The calculation involves dividing the number of discharges in an age group by the number of people in that age group within the population. This number is then multiplied by the size of the reference unit such as 100,000 people. The mathematical calculation is expressed as:

  1. Age-standardised hospitalisation rates.

Age-standardised rates account for differences in population age structure and are used to compare statistics over time andbetween different populations. It is expressed in this publication as the number of hospitalisations per 100,000 population. The calculation involves dividing the number of discharges in an age group by the number of people in the population within that age group, then multiplying by the Segi population figure in that age group and finally sum this value with the calculated values of all the other age groups. The mathematical calculation is expressed as:

Whereirepresents the age group being calculated.

Segi’s world population

Age group / Population / Age group / Population
0-4 / 12 000 / 50-54 / 5 000
5-9 / 10 000 / 55-59 / 4 000
10-14 / 9 000 / 60-64 / 4 000
15-19 / 9 000 / 65-69 / 3 000
20-24 / 8 000 / 70-74 / 2 000
25-29 / 8 000 / 75-79 / 1 000
30-34 / 6 000 / 80-84 / 500
35-39 / 6 000 / 85+ / 500
40-44 / 6 000 / Total / 100 000
45-49 / 6 000

Source: Segi M,Cancer mortality for selected sites in 24 countries (1950-57), Department of

Public Health, Tohoku University of Medicine, Sendai, Japan. 1960.

Ethnicity

The prioritisation system used is shown in the table below. This is the standard prioritisation of ethnicity that was developed by Statistics New Zealand, and is used by the New Zealand Health Information Service.

Ethnicity / Prioritisation order
Māori / 1
Tokelauan / 2
Fijian / 3
Niuean / 4
Tongan / 5
CookIsland Māori / 6
Samoan / 7
Other Pacific / 8
South East Asian / 9
Indian / 10
Chinese / 11
Other Asian / 12
Other / 13
Other European / 14
New Zealand European / 15
Not reported / 0

For example; if someone reported their main ethnicity as New Zealand European, their second ethnicity as Samoan and their third ethnicity as Māori, then their prioritised ethnicity will be recorded as Māori as it takes precedence in the order.

Additional information available

This publication contains selected hospital morbidity data. Should you require additional information, analysis or material tabulated in other ways, please contact:

Analytical Services
Business Intelligence Unit
New Zealand Health Information Service
Ministry of Health
PO Box 5013
Wellington
New Zealand / Telephone: (04) 922 1800
Fax: (04) 922 1899
E-mail:

Glossary

Age / The age in years of each patient at date of discharge.
Bed day / A period of a day or part thereof that a bed is occupied by an admitted patient during the reporting period.