Table S1. Multivariable logistic regressions1 comparing alcohol and drug use in the region of migration stages:Mexican migrants converging on the U.S.-Mexico border

Last 12-month at-risk drinking / Last 12-month illicit Drug Use
AOR (95% CI) / AOR (95% CI)
Overall
Migration stage
Pre-departure / Ref / Ref
Travel / 0.68 (0.32-1.42) / 0.76 (0.18-3.22)
Destination / 0.76 (0.54-1.09) / 2.42 (1.31-4.47)
Return / 1.18 (0.75-1.67) / 2.58 (1.30-5.11)
Age (years) / 0.97 (0.96-0.98) / 0.96 (0.94-0.98)
Female (Ref: male) / 0.53 (0.34-0.82) / 0.23 (0.09-0.61)
Indigenous ethnic / 0.89 (0.52-1.54) / 0.88 (0.42-1.85)
Married (Ref: non-married) / 0.88 (0.68-1.16) / 0.51 (0.34-0.78)
Completed high school education / 1.03 (0.78-1.38) / 0.57 (0.36-0.89)
Employment status
Full time employed / Ref / Ref
Part time employed / 1.22 (0.78-1.91) / 1.44 (0.83-2.51)
Other employment status / 0.87 (0.65-1.17) / 1.14 (0.70-1.87)
Plan to enter/ return to the U.S. / 1.35 (0.99-1.82) / 1.20 (0.78-1.83)
Male
Migration stage
Pre-departure / Ref / Ref
Travel / 0.52 (0.25-1.07) / 0.86 (0.18-4.02)
Destination / 0.81 (0.55-1.20) / 2.46 (1.32-4.59)
Return / 1.12 (0.73-1.71) / 2.65 (1.33-5.27)
Age (years) / 0.97 (0.96-0.98) / 0.96 (0.94-0.98)
Indigenous ethnic / 0.90 (0.51-1.60) / 0.89 (0.42-1.87)
Married (Ref: non-married) / 0.96 (0.72-1.28) / 0.52 (0.34-0.81)
Completed high school education / 0.98 (0.72-1.34) / 0.57 (0.36-0.91)
Employment status
Full time employed / Ref / Ref
Part time employed / 1.32 (0.82-2.12) / 1.48 (0.83-2.65)
Other employment status / 0.88 (0.64-1.20) / 1.33 (0.81-2.18)
Plan to enter/ return to the U.S. / 1.32 (0.96-1.80) / 1.17 (0.75-1.82)
Female
Migration stage
Pre-departure / Ref / Ref
Travel / 3.75 (0.68-20.9) / 1.29 (0.12-13.9)
Destination / 0.18 (0.06-0.49) / 1.60 (0.29-8.87)
Return / 0.62 (0.21-1.82) / 3.38 (0.43-26.5)
Age (years) / 0.95 (0.92-0.99) / 0.94 (0.86-1.02)
Indigenous ethnic / NA / NA
Married (Ref: non-married) / 0.42 (0.18-0.98) / 0.28 (0.05-1.70)
Completed high school education / 1.55 (0.64-3.80) / 0.40 (0.11-1.52)
Employment status
Full time employed / Ref / Ref
Part time employed / 0.22 (0.01-3.36) / 1.08 (0.07-17.2)
Other employment status / 0.88 (0.40-1.94) / 0.34 (0.08-1.55)
Plan to enter/ return to the U.S. / 3.02 (1.16-7.93) / 1.42 (0.28-7.37)

1 Logistic regression models were adjusted for time spent in the region represented by each migration stage during the past year.
* AOR: adjusted odds ratio; CI: confidence interval.

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Table S2. Multivariable logistic regressions1 comparing ATOD use in the region of migration stages among individuals from different flows:Mexican migrants converging on the U.S.-Mexico border

Last 12-month at-risk drinking / Last 12-month illicit Drug Use
AOR (95% CI) / AOR (95% CI)
Pre-departure
Contextual exposure
Northbound / Ref / Ref
Border / 0.68 (0.21-2.23) / 2.55 (0.47-13.8)
Age (years) / 0.97 (0.95-0.99) / 0.96 (0.02-0.99)
Female (Ref: male) / 0.50 (0.27-0.93) / 0.12 (0.02-0.71)
Indigenous ethnic / 0.62 (0.15-2.60) / NA
Married (Ref: non-married) / 0.90 (0.56-1.45) / 0.55 (0.24-1.26)
Completed high school education / 0.85 (0.53-1.38) / 0.22 (0.09-0.54)
Employment status
Full time employed / Ref / Ref
Part time employed / 2.35 (0.83-6.69) / 1.98 (0.32-12.3)
Other employment status / 1.27 (0.73-2.21) / 3.05 (0.97-9.53)
Plan to enter the U.S. / 1.03 (0.63-1.69) / 1.19 (0.47-3.03)
Destination
Contextual exposure
Southbound / Ref / Ref
Deported / 0.94 (0.65-1.36) / 1.24 (0.79-1.96)
Age (years) / 0.96 (0.94-0.98) / 0.95 (0.93-0.98)
Female (Ref: male) / 0.13 (0.06-0.28) / 0.18 (0.06-0.53)
Indigenous ethnic / 1.14 (0.51-2.56) / 1.53 (0.61-3.84)
Married (Ref: non-married) / 0.64 (0.41-1.00) / 0.51 (0.30-0.87)
Completed high school education / 1.70 (1.02-2.82) / 0.99 (0.55-1.81)
Employment status
Full time employed / Ref / Ref
Part time employed / 1.02 (0.55-1.91) / 1.48 (0.74-2.95)
Other employment status / 0.52 (0.31-0.89) / 0.63 (0.29-1.37)
Plan to return to the U.S. / 2.20 (1.26-3.83) / 1.63 (0.88-3.03)
Return
Contextual exposure
Northbound / Ref / Ref
Border / 1.09 (0.65-1.81) / 1.35 (0.49-3.70)
Age (years) / 0.96 (0.95-0.98) / 0.97 (0.94-1.00)
Female (Ref: male) / 0.39 (0.19-0.78) / 0.45 (0.08-2.74)
Indigenous ethnic / 1.06 (0.46-2.47) / 0.50 (0.06-4.00)
Married (Ref: non-married) / 1.21 (0.83-1.76) / 0.46 (0.20-1.05)
Completed high school education / 0.97 (0.64-1.47) / 0.52 (0.23-1.18)
Employment status
Full time employed / Ref / Ref
Part time employed / 1.31 (0.71-2.41) / 1.21 (0.35-4.16)
Other employment status / 0.69 (0.50-1.07) / 1.33 (0.59-3.01)
Plan to return to the U.S. / 1.32 (0.87-1.99) / 0.86 (0.40-1.88)

1 Logistic regression models were adjusted for time spent in the region represented by each migration stage during the past year.
* AOR: adjusted odds ratio; CI: confidence interval

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