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Table 2 Predictors of Unintended Pregnancy Using Poisson Regression, Rakai Community Cohort Study, Uganda 2001–2013

From: Facing HIV infection and unintended pregnancy: Rakai, Uganda, 2001–2013

  Poisson Regression (Unadjusted) Backwards Selection Multiple Poisson Regression (Adjusted)
n = 2819
RISK FACTORS Unintended v. Intended Unintended v. Intended
Risk Ratio 95% Lower 95% Upper P-value* Risk Ratio 95% Lower 95% Upper P-value*
Sample Characteristics
 Pre or Post ART         
 pre 2004 ref ref ref ref ref ref ref ref
 post 2004 0.78 0.69 0.87 <.001 0.75 0.66 0.84 <.001
Individual Characteristics
Age
 15–19 1.14 0.93 1.41 0.207 1.37 1.09 1.73 0.007
 20–24 0.92 0.79 1.07 0.265 0.99 0.85 1.16 0.948
 25–29 ref ref ref ref ref ref ref ref
 30–34 1.13 0.97 1.33 0.121 1.07 0.91 1.26 0.414
 35–39 1.34 1.10 1.63 0.004 1.23 1.00 1.51 0.048
 40–49 1.79 1.34 2.38 <.001 1.54 1.14 2.07 0.005
Education
 No school 1.15 0.91 1.44 0.234 1.10 0.87 1.40 0.411
 Primary school ref ref ref ref ref ref ref ref
 Secondary schol or more 0.70 0.61 0.79 <.001 0.80 0.70 0.92 0.002
SES
 low ref ref ref ref ref ref ref ref
 middle 0.92 0.8 1.06 0.261 0.99 0.86 1.14 0.899
 high 0.78 0.68 0.89 <.001 0.91 0.78 1.05 0.177
HIV Status
 Positive 1.14 0.96 1.35 0.145 1.14 0.96 1.35 0.149
Parity
 0 0.63 0.47 0.83 <.001 0.61 0.45 0.81 <.001
 1 or 2 ref ref ref ref ref ref ref ref
 3 or 4 1.22 1.05 1.42 0.009 1.25 1.06 1.47 0.009
 5+ 1.26 1.11 1.44 <.001 1.29 1.11 1.51 <.001
Marriage Status
 never married 0.95 0.78 1.16 0.596     
 married ref ref ref ref     
 separated or widowed 1.18 0.97 1.43 0.094     
Number of Sex Partners Ever
 0–1 1.11 0.97 1.26 0.124     
 2 or 3 ref ref ref ref     
 4+ 1.11 0.96 1.28 0.165