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Table 3 Multivariate prevalence ratiosa (CI95%) for smoking, drinking alcohol and sexually activityb

From: Risk behaviors of 15–21 year olds in Mexico lead to a high prevalence of sexually transmitted infections: results of a survey in disadvantaged urban areas

Variable

Categories

PR of smoking

PR of drinking

PR of sexually active

Age

15 – 18

1.0

1.0

1.0

 

19 – 21

0.931 (0.804 – 1.051)

1.152 (1.049 – 1.245)***

1.298 (1.153 – 1.439)***

Sex

Women

1.0

1.0

1.0

 

Men

3.101 (2.489 – 3.621)***

1.781 (1.538 – 2.003)***

0761 (0.671 – 0.856)

Socioeconomic level

Lowest 20%

1.0

1.0

1.0

 

Second lower 20%

0.981 (0.903 – 1.040)

1.006 (0.956 – 1.047)

1.236 (1.003 – 1.507)**

 

Remaining 60%

1.018 (0.985 – 1.040)

1.034 (1.009 – 1.052)**

1.541 (1.117 – 2.101)***

Adolescent attending school

No

1.0

1.0

1.0

 

Yes

0.759 (0.592 – 0.896)***

0.957 (0.836 – 1.058)

0.447 (0.325 – 0.606)***

Education level at standard for age

No

1.0

1.0

1.0

 

Yes

0.932 (0.859 – 0.987)**

1.002 (0.932 – 1.060)

0.529 (0.391 – 0.707)***

Educational gap of adolescents not attending school

and with education level not standard for age

0

1.0

1.0

1.0

 

Years of gap

0.993 (0.981 – 1.005)

0.997 (0.986 – 1.007)

1.000 (0.994 – 1.002)

Report labor activities

No

1.0

1.0

1.0

 

Yes

1.115 (0.901 – 1.347)

1.314 (1.075 – 1.550)***

0.700 (0.619 – 0.785)***

Attending school and report labor activities

No

1.0

1.0

1.0

 

Yes

1.028 (0.989 – 1.046)

0.977 (0.899 – 1.024)

1.266 (0.782 – 1.999)

Living with a partner

No

1.0

1.0

1.0

 

Yes

1.006 (0.902 – 1.082)

0.963 (0.894 – 1.024)

3.241 (2.854 – 3.616)***

Count with a close friend

No

1.0

1.0

1.0

 

Yes

1.016 (0.762 – 1.316)

0.924 (0.787 – 1.075)

0.965 (0.806 – 1.145)

Geographical area of residence

Center

1.0

1.0

1.0

 

Golf

0.922 (0.832 – 0.994)**

0.933 (0.845 – 1.003)*

1.264 (1.016 – 1.548)**

 

North

1.078 (0.873 – 1.228)

0.998 (0.893 – 1.080)

1.131 (0.919 – 1.375)

 

North Pacific

0.990 (0.929 – 1.021)

1.001 (0.981 – 1.015)

1.389 (1.049 – 1.828)***

 

Central Pacific

1.024 (0.862 – 1.131)

1.147 (1.049 – 1.220)***

1.204 (0.935 – 1.530)

 

South Pacific

0.876 (0.723 – 0.969)***

0.914 (0.798 – 0.990)**

1.018 (0.801 – 1.279)

 

Yucatan peninsula

0.980 (0.958 – 0.995)***

0.998 (0.976 – 1.013)

0.909 (0.679 – 1.213)

Nc

 

9168

9186

13,197

  1. a Estimated using the formulae PR = OR/[(1-P0)+(P0*OR)] as suggested by Zhang & Yu [18]. b Confidence intervals were estimated reflecting design effect. c Number of observations is less than in descriptive because of missing values. ***P-value < 1%; **P-value < 5%; * P-value < 10%