Supplemental Digital Content (SDC)

Supplemental digital content (SDC)

Table 1(SDC). Case-control studies excluded from the Meta-analysis and reasons for exclusion

Authors (Year of publication) / Short reference / Reason for exclusion / Partial or complete overlap with:
Burch, Howe et al. (1981) / [1] / risk estimates not adjusted for tobacco and alcohol
Elwood, Pearson et al.(1984) / [2] / risk estimates not adjusted for tobacco and alcohol
Coggon, Pannett et al. (1986) / [3] / no specific occupational classes studied
Bravo, Espinosa et al.(1990) / [4] / risk estimates not adjusted for tobacco and alcohol
Vaughan and Davis (1991) / [5] / no specific occupational classes studied / Wortley et al., 1992
Succo, Giordano et al. (1991) / [6] / no specific occupational classes studied
Maier, Dietz et al. (1991) / [7] / no specific occupational classes studied
Zheng, Blot et al. (1992) / [8] / risk estimates not adjusted for alcohol
Maier, Gewelke et al. (1992) / [9] / no specific occupational classes studied / Maier et al., 1991
Imbernon, Goldberg et al. (1995) / [10] / no specific occupational classes studied
Gustavsson, Bellander et al. (1995) / [11] / no specific occupational classes studied
Laforest, Luce et al. (2000) / [12] / no specific occupational classes studied / Goldberg et al., 1997
Marchand, Luce et al. (2000) / [13] / no specific occupational classes studied / Goldberg et al., 1997
Elci, Akpinar-Elci et al. (2002) / [14] / no specific occupational classes studied / Elci et al., 2001
Elci, Akpinar-Elci et al. (2003) / [15] / no specific occupational classes studied / Elci et al., 2001
Berrino, Richiardi et al. (2003) / [16] / no specific occupational classes studied / Boffetta et al., 2003
Dietz, Ramroth et al. (2004) / [17] / no specific occupational classes studied / Becher et al., 2005
Menvielle, Luce et al. (2004) / [18] / no specific occupational classes studied / Goldberg et al., 1997
Shangina, Brennan et al. (2006) / [19] / no specific occupational classes studied
Pinar, Akdur et al. (2007) / [20] / no specific occupational classes studied
Sartor, Eluf-Neto et al. (2007) / [21] / no specific occupational classes studied
Duran de Alba and Roa Castro (2008) / [22] / no specific occupational classes studied
Ramroth, Dietz et al. (2008) / [23] / no specific occupational classes studied / Becher et al., 2005
Elci and Akpinar-Elci (2009) / [24] / no specific occupational classes studied / Elci et al., 2001
Ramroth, Ahrens et al. (2011) / [25] / no specific occupational classes studied / Becher et al., 2005
Luce, Stuecker et al. (2011) / [26] / no specific occupational classes studied

Supplemental references

1.Burch JD, Howe GR, Miller AB, Semenciw R. Tobacco, alcohol, asbestos, and nickel in the etiology of cancer of the larynx: a case-control study. J Natl Cancer Inst. 1981;67(6):1219-24.

2.Elwood JM, Pearson JC, Skippen DH, Jackson SM. Alcohol, smoking, social and occupational factors in the aetiology of cancer of the oral cavity, pharynx and larynx. Int J Cancer. 1984;34(5):603-12.

3.Coggon D, Pannett B, Osmond C, Acheson ED. A survey of cancer and occupation in young and middle aged men. I. Cancers of the respiratory tract. Br J Ind Med. 1986;43(5):332-8.

4.Bravo MP, Espinosa J, Calero JR. Occupational risk factors for cancer of the larynx in Spain. Neoplasma. 1990;37(4):477-81.

5.Vaughan TL, Davis S. Wood dust exposure and squamous cell cancers of the upper respiratory tract. Am J Epidemiol. 1991;133(6):560-4.

6.Succo G, Giordano C, Riva F, Vico F, Sorrentino R, Di Scalzi GL, et al.[A case-control study of multiple occupational risk factors in relation to laryngeal cancer]. Acta Otorhinolaryngol Ital. 1991;11(4):417-28.

7.Maier H, Devries N, Snow GB. Occupational factors in the etiology of head and neck-cancer. Clinical Otolaryngology. 1991;16(4):406-12.

8.Zheng W, Blot WJ, Shu XO, Gao YT, Ji BT, Ziegler RG, et al. Diet and other risk factors for laryngeal cancer in Shanghai, China. Am J Epidemiol. 1992;136(2):178-91.

9.Maier H, Gewelke U, Dietz A, Heller WD. Risk factors of cancer of the larynx: results of the Heidelberg case-control study. Otolaryngol Head Neck Surg. 1992;107(4):577-82.

10.Imbernon E, Goldberg M, Bonenfant S, Chevalier A, Guenel P, Vatre R, et al. Occupational respiratory cancer and exposure to asbestos: a case-control study in a cohort of workers in the electricity and gas industry. Am J Ind Med. 1995;28(3):339-52.

11.Gustavsson P, Bellander T, Johansson L, Salmonsson S. Surveillance of mortality and cancer incidence among Swedish graphite electrode workers. Environ Res. 1995;70(1):7-10.

12.Laforest L, Luce D, Goldberg P, Begin D, Gerin M, Demers PA, et al.Laryngeal and hypopharyngeal cancers and occupational exposure to formaldehyde and various dusts: a case-control study in France. Occup Environ Med. 2000;57(11):767-73.

13.Marchand JL, Luce D, Leclerc A, Goldberg P, Orlowski E, Bugel I, et al. Laryngeal and hypopharyngeal cancer and occupational exposure to asbestos and man-made vitreous fibers: results of a case-control study. Am J Ind Med. 2000;37(6):581-9.

14.Elci OC, Akpinar-Elci M, Blair A, Dosemeci M. Occupational dust exposure and the risk of laryngeal cancer in Turkey. Scand J Work Environ Health. 2002;28(4):278-84.

15.Elci OC, Akpinar-Elci M, Blair A, Dosemeci M. Risk of laryngeal cancer by occupational chemical exposure in Turkey. J Occup Environ Med. 2003;45(10):1100-6.

16.Berrino F, Richiardi L, Boffetta P, Esteve J, Belletti I, Raymond L, et al. Occupation and larynx and hypopharynx cancer: a job-exposure matrix approach in an international case-control study in France, Italy, Spain and Switzerland. Cancer Causes Control. 2003;14(3):213-23.

17.Dietz A, Ramroth H, Urban T, Ahrens W, Becher H. Exposure to cement dust, related occupational groups and laryngeal cancer risk: results of a population based case-control study. Int J Cancer. 2004;108(6):907-11.

18.Menvielle G, Luce D, Goldberg P, Leclerc A. Smoking, alcohol drinking, occupational exposures and social inequalities in hypopharyngeal and laryngeal cancer. International Journal of Epidemiology. 2004;33(4):799-806.

19.Shangina O, Brennan P, Szeszenia-Dabrowska N, Mates D, Fabianova E, Fletcher T, et al. Occupational exposure and laryngeal and hypopharyngeal cancer risk in central and eastern Europe. Am J Epidemiol. 2006;164(4):367-75.

20.Pinar T, Akdur R, Tuncbilek A, Altundag K, Cengiz M. The relationship between occupations and head and neck cancers. Journal of the National Medical Association. 2007;99(1):64-+.

21.Sartor SG, Eluf-Neto J, Travier N, Filho VW, Arcuri ASA, Kowalski LP, et al. Occupational risks for laryngeal cancer: a case-control study. Cadernos De Saude Publica. 2007;23(6):1473-81.

22.Duran de Alba LM, Roa Castro FM. Risk factors for developing laryngeal cancer in adult population at the Hospital Espanol in Mexico City. Acta otorrinolaringologica espanola. 2008;59(8):367-70.

23.Ramroth H, Dietz A, Ahrens W, Becher H. Occupational wood dust exposure and the risk of laryngeal cancer: a population based case-control study in Germany. Am J Ind Med. 2008;51(9):648-55.

24.Elci OC, Akpinar-Elci M. Occupational exposures and laryngeal cancer among non-smoking and non-drinking men. Int J Occup Environ Health. 2009;15(4):370-3.

25.Ramroth H, Ahrens W, Dietz A, Becher H. Occupational asbestos exposure as a risk factor for laryngeal carcinoma in a population-based case-control study from Germany. Am J Ind Med. 2011;54(7):510-4.

26.Luce D, Stuecker I, Icare Study Grp. Investigation of occupational and environmental causes of respiratory cancers (ICARE): a multicenter, population-based case-control study in France. Bmc Public Health. 2011;11.

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Table 2(SDC): Occupation and laryngeal cancer risk- Minor groups (2-digit) and job titles (3-digit) according to ISCO-1968.

ISCO Code / Unit Group- Job Title / Cases / Controls / Meta Effects
(fixed or random) / Heterogeneity
OR [95% CI] / I² (%) / P
5-0 MANAGERS (CATERING AND LODGING SERVICES) / 6 / / / 7 / 2.35 / [0.65-8.50] / . / .
5-1 WORKING PROPRIETORS (CATERING AND LODGING SERVICES) / 9 / / / 12 / 1.53 / [0.53-4.46] / F / 46.0 / 0.16
5-2 HOUSEKEEPING AND RELATED SERVICE SUPERVISORS / not reported
5-3 COOKS, WAITERS, BARTENDERS AND RELATED WORKERS / 91 / / / 172 / 1.53 / [0.53-4.46] / F / 46.0 / 0.16
5-31 / Cooks / 22 / / / 60 / 0.96 / [0.54- 1.71] / . / .
5-32 / Waiters, bartenders and related workers / 62 / / / 103 / 1.04 / [0.70-1.53] / F / 38.1 / 0.15
5-3X / Cooks, Waiters, bartenders and related workers not elsewhere classified / 7 / / / 9 / 2.20 / [0.68-7.11] / . / .
5-3&5-4 COOKS,WAITERS, BARTENDERS& MAIDS AND RELATED HOUSEKEEPING SERVICE WORKERS / 5 / 17 / 1.30 / [0.40-4.10] / . / .
5-4 MAIDS AND RELATED HOUSEKEEPING SERVICE WORKERS / 16 / / / 49 / 1.98 / [1.01-3.88] / F / 0.1 / 0.41
5-5 BUILDING CARETAKERS, CHARWORKERS AND CLEANERS AND RELATED WORKERS / 131 / / / 186 / * / 1.13 / [0.90-1.43] / F / 0.0 / 0.54
5-51 / Building caretakers / 24 / / / 51 / 1.08 / [0.75-1.54] / F / 0.0 / 0.86
5-52 / Charworkers, cleaners / 36 / / / 87 / 1.45 / [0.90-2.34] / F / 0.0 / 0.59
5-5X / Building caretakers, charworkers and cleaners and related workers not elsewhere classified / 71 / / / 48 / 1.19 / [0.85-1.68] / F / 37.7 / 0.19
5-6 LAUNDERES, DRY CLEANERS AND PRESSERS / 11 / / / 8 / * / 2.05 / [0.82-5.14] / F / 0.0 / 0.59
5-7 HAIRDRESSERS, BARBERS, BEAUTICIANS AND RELATED WORKERS / 15 / / / 27 / * / 2.10 / [0.99-4.48] / F / 0.0 / 0.59
5-8 PROTECTIVE SERVICE WORKERS / 129 / / / 128 / * / 1.19 / [0.93-1.52] / F / 44.3 / 0.06
5-81 / Firefighters / 10 / / / 7 / * / 1.34 / [0.17-10.92] / R / 66.3 / 0.09
5-82 / Policemen and detectives / 10 / / / 51 / 0.34 / [0.07-1.74] / R / 70.9 / 0.06
5-8X / Protective service workers not elsewhere classified / 109 / / / 70 / * / 1.32 / [1.01-1.73] / F / 0.0 / 0.67
5-9 SERVICE WORKERS NOT ELSEWHERE CLASSIFIED / 212 / / / 275 / 0.93 / [0.59-1.46] / R / 60.5 / 0.01

1

6-0 FARM MANAGERS AND SUPERVISORS / 32 / / / 84 / * / 0.70 / [0.40-1.10] / . / .
6-0&6-1 FARM MANGERS, SUPERVISORS & FARMERS / 55 / 49 / 0.70 / [0.40-1.10] / . / .
6-1 FARMERS / 215 / / / 500 / * / 1.21 / [0.97-1.50] / F / 15.7 / 0.28
6-11 / General farmers / 12 / / / 29 / 1.48 / [0.70- 3.12] / . / .
6-12 / Specialised farmers / 76 / / / 144 / 1.44 / [0.99-2.10] / F / 12.1 / 0.34
6-1X / Farmers not elsewhere classified / 127 / / / 327 / 1.05 / [0.78-1.40] / F / 21.8 / 0.26
6-1&6-2 FARMERS AND AGRICULTURE AND ANIMAL HUSBANDRY WORKERS / 94 / / / 590 / 1.05 / [0.81-1.35] / F / 0.0 / 0.48
6-2 AGRICULTURE AND ANIMAL HUSBANDRY WORKERS / 287 / / / 479 / * / 1.09 / [0.89-1.32] / F / 0.0 / 0.64
6-21 / General farm workers / 133 / / / 242 / 1.04 / [0.80-1.34] / F / 0.0 / 0.95
6-22 / Field crop and vegetable farm workers / 8 / / / 17 / 1.35 / [0.25-7.30] / . / .
6-24 / Livestock workers / 5 / / / 13 / 0.37 / [0.11-1.23] / . / .
6-25 / Dairy farm workers / 2 / / / 4 / 0.49 / [0.08-3.10] / . / .
6-27 / Nursery workers and gardeners / 35 / / / 90 / 0.93 / [0.49-1.77] / . / .
6-28 / Farm machinery operators / 13 / / / 53 / 0.86 / [0.39-1.89] / F / 21.9 / 0.26
6-2X / Agricultural and animal husbandry workers not elsewhere classified / 91 / / / 60 / 1.64 / [1.07-2.51] / F / 0.0 / 0.92
6-3 FORESTRY WORKERS / 29 / / / 43 / 1.88 / [1.08-3.30] / F / 49.6 / 0.11
6-31 / Loggers / 29 / / / 43 / 1.88 / [1.08-3.30] / F / 49.6 / 0.11
6-3&6-4 FORESTRY WORKERS AND FISHERMEN, HUNTERS AND RELATED WORKERS / 17 / / / 8 / 0.90 / [0.30-2.30] / . / .
6-4 FISHERMEN, HUNTERS AND RELATED WORKERS / 9 / / / 12 / 1.36 / [0.48-3.88] / F / 40.6 / 0.19
6-41 / Fishermen / 3 / / / 4 / 3.37 / [0.60-18.90] / . / .
6-4X / Fishermen, hunters and related workers not elwhere classified / 6 / / / 8 / 0.80 / [0.21-2.99] / . / .

1

7-0 PRODUCTION SUPERVISORS / 97 / / / 133 / * / 1.17 / [0.87-1.57] / F / 1.8 / 0.42
7-1 MINERS / 139 / / / 109 / * / 1.59 / [1.20-2.12] / F / 3.4 / 0.41
7-11 / Miners and quarrymen / 23 / / / 25 / 0.87 / [0.36- 2.10] / . / .
7-12 / Mineral and stone treaters / 5 / / / 1 / 6.30 / [0.65-61.08] / . / .
7-1X / Miners not elsewhere classified / 111 / / / 83 / 1.67 / [1.23-2.27] / F / 0.0 / 0.53
7-2 METAL PROCESSORS / 165 / / / 176 / * / 1.22 / [0.96-1.56] / F / 5.5 / 0.39
7-21 / Metal smelting, converting and refining furnacemen / 7 / / / 14 / 0.75 / [0.25-2.22] / . / .
7-24 / Metal casters / 2 / / / 5 / 1.35 / [0.25-7.30] / . / .
7-2X / Metal processers not elsewhere classified / 156 / / / 157 / 1.25 / [0.97-1.61] / F / 15.8 / 0.29
7-3 WOOD PREPARATION WORKERS AND PAPER MAKERS NOT ELSEWHERE CLASSIFIED / 10 / / / 12 / 0.52 / [0.17-1.61] / F / 0.0 / 0.40
7-4 CHEMICAL PROCESSORS AND RELATED WORKERS / 23 / / / 23 / 1.95 / [1.00-3.81] / F / 0.0 / 0.66
7-41 / Crushers, grinders and mixers / 3 / / / 5 / 1.80 / [0.86-3.76] / . / .
7-4X / Chemical processors not elsewhere classified / 20 / / / 18 / 2.84 / [0.56-14.30] / F / 0.0 / 0.51
7-5 SPINNERS, WEAVERS, KNITTERS, DYERS AND RELATED WORKERS / 37 / / / 27 / 2.60 / [1.35-5.01] / F / 0.0 / 0.86
7-52 / Spinners and winders / 8 / / / 9 / 4.17 / [1.15-15.19] / F / 0.0 / 0.64
7-54 / Weavers and related workers / 6 / / / 11 / 2.75 / [0.82-9.24] / F / 0.0 / 0.69
7-5X / Spinners, weavers, knitters, dyers and related workers not elsewhere classified / 23 / / / 7 / 1.90 / [0.70-5.00] / . / .
7-6 TANNERS, FELLMONGERS AND PELT DRESSERS / not reported
7-7 FOOD AND BEVERAGE PROCESSERS / 231 / / / 229 / * / 1.31 / [1.05-1.63] / F / 0.0 / 0.56
7-75 / Butchers / 68 / / / 62 / 1.75 / [1.15-2.64] / F / 27.1 / 0.25
7-76 / Bakers / 71 / / / 45 / * / 1.31 / [0.89-1.92] / F / 0.0 / 0.55
7-79 / Food & beverage processers not elsewhere classified / 92 / / / 122 / * / 1.07 / [0.76-1.52] / F / 0.0 / 0.80
7-8 TOBACCO PREPARERS AND TOBACCO PRODUCT MAKERS / not reported
7-9 TAILORS, DRESSMAKERS, SEWERS, UPHOLSTERERS AND RELATED WORKERS / 86 / / / 120 / * / 1.69 / [1.23-2.32] / F / 15.4 / 0.30
7-91 / Tailors and dressmakers / 1 / 14 / 0.54 / [0.06-4.70] / . / .
7-95 / Sewers and embroiderers / 5 / 32 / 0.27 / [0.42-3.84] / . / .
7-9X / Tailors, dressmakers, sewers, upholsterers and related workers not elsewhere classified / 80 / 74 / 1.78 / [1.27-2.49] / F / 24.1 / 0.24
7-9&8-0 TAILORS, DRESSMAKERS, SEWERS AND RELATED WORKERS & SHOEMAKERS / 8 / / / 2 / 8.19 / [1.49-45.03] / . / .

1

8-0 SHOEMAKERS, LEATHER GOODS MAKERS / 31 / / / 36 / 1.32 / [0.76-2.31] / F / 18.1 / 0.30
8-01 / Shoe makers/ repairers / 15 / 20 / 1.22 / [0.58-2.60] / . / .
8-02 / Shoe finishers / 7 / 3 / 3.23 / [0.75-13.91] / . / .
8-0X / Shoemakers, leather goods makers makers nec. / 9 / 13 / 1.01 / [0.37-2.74] / 47.4 / 0.30
8-1 CABINETMAKERS AND RELATED WOODWORKERS / 93 / / / 148 / 1.26 / [0.92-1.73] / F / 21.5 / 0.23
8-11 / Cabinetmakers / 16 / 29 / 1.18 / [0.60-2.33] / . / .
8-12 / Woodworking machine operators / 18 / 38 / 1.12 / [0.40-3.19] / 60.9 / 0.08
8-1X / Cabinetmakers and related woodworkers not elsewhere classified / 59 / # / 81 / 1.40 / [0.92-2.15] / 15.5 / 0.31
8-2 STONE CUTTERS AND CARVERS / 5 / / / 3 / 3.69 / [0.68-22.68] / 0.0 / 0.74
8-3 BLACKSMITHS,TOOLMAKERS AND MACHINE-TOOL OPERATORS / 383 / / / 490 / * / 1.45 / [1.23-1.71] / F / 10.8 / 0.29
8-31 / Blacksmiths / 50 / / / 35 / 2.10 / [1.24-3.56] / F / 0.0 / 0.70
8-32 / Toolmakers and metal markers / 18 / / / 16 / 2.22 / [0.99-4.97] / F / 0.0 / 0.39
8-33/34 / Machine tool setter-operator and machine tool operator / 217 / / / 298 / * / 1.34 / [1.08-1.65] / F / 28.6 / 0.16
8-35 / Metal grinders, polishers and tool sharpeners / 31 / / / 45 / 1.51 / [0.84-2.72] / F / 8.3 / 0.35
8-3X / other blacksmiths, toolmakers, machine tool operators not elsewhere classified / 67 / / / 96 / 1.38 / [0.94-2.03] / F / 25.4 / 0.24
8-4 MACHINERY FITTERS, MACHINE ASSEMBLERS AND PRECISION INSTRUMENT MAKERS / 494 / / / 759 / * / 1.13 / [0.98-1.30] / F / 0.0 / 0.54
8-41 / Machinery fitters, machine assemblers / 110 / / / 197 / 1.11 / [0.84-1.48] / F / 14.1 / 0.32
8-42 / Watch, clock and precision instrument makers / 7 / / / 3 / 0.71 / [0.15-3.38] / . / .
8-43 / Motor vehicle mecanics / 322 / / / 447 / * / 1.23 / [1.03-1.47] / F / 0.0 / 0.67
8-4X / Machinery fitters, assemblers (not electric) not elsewhere classified / 55 / / / 112 / 0.76 / [0.51-1.15] / F / 0.0 / 0.78
8-5 ELECTRICAL FITTERS AND RELATED ELECTRICAL AND ELECTRONICAL WORKERS / 108 / / / 239 / * / 0.87 / [0.66-1.14] / F / 27.2 / 0.14
8-51 / Electrical fitters / 5 / 21 / 0.41 / [0.14-1.21] / . / .
8-52 / Electronics fitters / 7 / 15 / 3.08 / [0.97-9.80] / . / .
8-53 / Electrical and electronics equipment assemblers / 5 / 15 / 0.91 / [0.26-3.21] / 6.7 / 0.30
8-54 / Radio and television repairmen / 2 / 5 / 2.63 / [0.48-14.30] / . / .
8-55 / Electrical wiremen / 16 / 52 / 0.75 / [0.40-1.41] / . / .
8-56 / Telephone and telegraph installers / 3 / 14 / 0.39 / [0.09-1.69] / . / .
8-57 / Electric linemen and cable jointers / 5 / 14 / 1.09 / [0.37-3.20] / . / .
8-5X / Electrical fitters and related electrical and electronics workers not elsewhere classified / 65 / 103 / 0.85 / [0.59-1.24] / 29.0 / 0.19
8-6 BROADCASTING STATION, SOUND EQUIPMENT OPERATORS, CINEMA PROJECTIONIST / not reported
8-7 PLUMBERS,WELDERS, SHEET METAL AND STRUCTURAL METAL PREPARERS / 294 / / / 478 / * / 1.17 / [0.98-1.39] / F / 7.2 / 0.36
8-71 / Plumbers and pipefitters / 94 / / / 140 / 1.19 / [0.86-1.65] / F / 41.0 / 0.11
8-72 / Welders and flame-cutters / 116 / / / 212 / * / 1.17 / [0.90-1.53] / F / 0.0 / 0.50
8-73 / Sheet metal workers / 50 / / / 77 / 1.18 / [0.75-1.86] / F / 8.8 / 0.36
8-74 / Structural metal preparers / 34 / / / 49 / 1.08 / [0.65-1.80] / F / 2.4 / 0.38
8-8 JEWELLERY AND PRECIOUS METAL WORKERS / not reported
8-9 GLASS FORMERS, POTTERS AND RELATED WORKERS / 37 / / / 52 / 1.78 / [0.99-3.20] / F / 29.4 / 0.22
8-91 / Glass formers, cutters, grinders and finishers / 5 / 7 / 1.51 / [0.40-5.74] / . / .
8-92 / Potters / 10 / 4 / 5.91 / [1.46-24.00] / . / .
8-93 / Glass and ceramics kilnmen / 2 / 3 / 1.03 / [0.14-7.47] / . / .
8-94 / Glass formers, potters and related workers nec. / 20 / 38 / 1.39 / [0.62-3.09] / F / 43.5 / 0.17

1

9-0 RUBBER AND PLASTIC PRODUCT MAKERS / 12 / / / 23 / 0.54 / [0.18-1.57] / F / 35.2 / 0.21
9-1 PAPER AND PAPER BOARD PRODUCT MAKERS / not reported
9-2 PRINTER AND RELATED WORKERS / 22 / / / 39 / 0.98 / [0.53-1.81] / F / 30.4 / 0.22
9-21 / Compositors and typesetters / 6 / / / 9 / 1.70 / [0.50-5.78] / . / .
9-22 / Printing pressmen / 3 / / / 8 / 1.69 / [0.42-6.79] / . / .
9-2X / Printers not elsewhere classified / 13 / / / 22 / 0.62 / [0.27-1.43] / 38.3 / 0.2
9-3 PAINTERS / 128 / / / 160 / * / 1.44 / [1.09-1.91] / F / 0.0 / 0.70
9-31 / Painters, construction / 36 / 48 / 1.36 / [0.82-2.24] / 0.0 / 0.99
9-32 / Painters / 92 / 112 / 1.48 / [1.05-2.08] / 0.0 / 0.52
9-4 PRODUCTION AND RELATED WORKERS NEC. / 13 / / / 8 / 1.37 / [0.49-3.79] / F / 0.0 / 0.43
9-5 BRICKLAYERS, CARPENTERS AND OTHER CONSTRUCTION WORKERS / 725 / / / 933 / * / 1.34 / [1.19-1.51] / F / 10.1 / 0.29
9-51 / Bricklayer and masons / 242 / / / 443 / 1.08 / [0.87-1.32] / F / 18.0 / 0.29
9-52 / Reinforced concreters, cement finishers and terrazzo workers / 40 / / / 26 / 2.39 / [1.33-4.28] / F / 0.0 / 0.96
9-53 / Roofers / 27 / / / 86 / 0.73 / [0.41-1.30] / F / 0.0 / 0.67
9-54 / Carpenters, joiners and paquetry workers / 119 / / / 166 / 1.35 / [1.02-1.79] / F / 0.0 / 0.99
9-55 / Plasterers / 15 / / / 11 / 2.33 / [0.94-5.77] / F / 0.0 / 0.79
9-56 / Insulators / 5 / / / 5 / 2.30 / [0.61-8.65] / . / .
9-5X / Construction workers not elsewhere classified / 277 / / / 196 / * / 1.57 / [1.29-1.92] / F / 10.6 / 0.34
9-6 STATIONERY ENGINE AND RELATED EQUIPMENT OPERATORS / 36 / / / 28 / * / 0.93 / [0.40-2.21] / R / 56.2 / 0.06
9-7 MATERIAL HANDLING AND RELATED EQUIPMENT OPERATORS, DOCKERS / 152 / / / 24 / * / 1.03 / [0.80-1.32] / F / 43.1 / 0.06
9-71 / Dockers and freight handlers / 72 / / / 125 / 0.84 / [0.44-1.61] / R / 60.5 / 0.06
9-73 / Crane and hoist operators / 9 / / / 12 / 2.22 / [0.83-5.94] / . / .
9-74 / Earth moving and related machinery operators / 26 / / / 17 / 1.86 / [1.02-3.38] / F / 0.0 / 0.63
9-7X / Material handling and related equipment operators nec. / 45 / / / 70 / 0.85 / [0.55-1.33] / F / 0.0 / 0.40
9-7& 9-8 MATERIAL HANDLING AND TRANSPORT EQUIPMENT OPERATORS / 54 / / / 24 / * / 1.28 / [0.84-1.95] / F / 46.9 / 0.17
9-8 TRANSPORT EQUIPMENT OPERATORS / 567 / / / 594 / * / 1.33 / [1.15-1.52] / F / 18.6 / 0.21
9-81 / Ships' deck ratings, barge crews and boatmen / 27 / / / 28 / 0.76 / [0.46-1.25] / F / 0.0 / 0.41
9-85 / Transport equipment operators (Drivers) / 375 / / / 479 / 1.34 / [1.14-1.57] / F / 7.6 / 0.37
9-8X / Transport equipment operators not elsewhere classified / 165 / / / 87 / 1.54 / [1.11-2.13] / F / 0.0 / 0.60
9-9 LABOURERS NOT ELSEWHERE CLASSIFIED / 429 / / / 505 / *† / 1.60 / [1.38-1.85] / F / 48.4 / 0.04
*incomplete number of controls: missing data for study of Elci, 2005; † incomplete number of cases and controls : missing data for study of Brownson, 1987
Effects reported: F=Fixed Effects Model; R=Random Effects Model; OR= Odds ratio; CI=Confidence interval

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