Table 4 Unadjusted associations between the predictors of interest and vaginal washing and lubrication in the past month among female sex workers in Tijuana and Ciudad Juarez, Mexico

 Age (years)

1.04

1.01, 1.06

1.01

0.99, 1.04

 Tijuana study site

4.49

2.70, 7.45

2.15

1.35, 3.43

 Born in same state as study site

0.47

0.29, 0.76

0.47

0.29, 0.74

 Completed secondary school

0.74

0.46, 1.19

0.89

0.56, 1.41

 Married/common-law relationship

0.89

0.53, 1.52

0.96

0.57, 1.61

 Number of children

1.12

0.99, 1.28

1.00

0.88, 1.13

 Average monthly income ≥3500 pesos (~ 172 USD)

0.25

0.15, 0.42

0.67

0.41, 1.12

 Illicit drug use (past month)

1.25

0.77, 2.03

0.89

0.55, 1.42

 Any hazardous alcohol consumption (past 12 months)

0.51

0.31, 0.82

0.67

0.42, 1.06

 Main sex work location identified as the street

3.70

2.26, 6.07

1.69

1.06, 2.71

 Difference in USD earned for condomless VS

1.02

1.00, 1.04

1.00

0.98, 1.02

 Ever forced to have sex or physically abused by a client

0.98

0.60, 1.59

0.96

0.60, 1.55

 Number of clients (past month)

1.00

0.99, 1.01

1.00

0.99, 1.01

 Any drug/alcohol use during sex with clients (past month)

0.79

0.49, 1.28

0.51

0.31, 0.82

 % of VS acts with clients with condoms (past month)

2.43

1.15, 5.16

1.79

0.87, 3.66

 Routine gynecological exam (past 6 months)

0.77

0.37, 1.61

0.84

0.42, 1.68

 Contraceptive use other than condoms (past 6 months)

0.41

0.25, 0.66

0.53

0.33, 0.84

 HIV/STI testing (past 6 months)

1.74

1.06, 2.85

1.71

1.04, 2.80

 Current vaginal symptoms

0.71

0.43, 1.19

1.48

0.90, 2.43

 Current pain during VS

1.69

0.83, 3.47

2.24

1.03, 4.87

 Tested positive for an STI

1.03

0.57, 1.88

0.76

0.42, 1.35

 Vaginal lubrication

3.04

1.85, 5.00

–

–

 Vaginal washing

–

–

3.04

1.85, 5.00