Table 2 Logistic regression analysis of STIs, social and behavioural factors associated with pregnancy

Age in years

1.76 (1.60–1.95)^**

2.10 (1.84–2.39)^**

Living with both parents

0.57 (0.42–0.76)^**

0.39 (0.26–0.59)^**

Level of education in the household ^b

0.90 (0.66–1.23)

Percentage of adults employed in the household

0.95 (0.86–1.04)

Sexual debut before 16 years of age

1.56 (1.22–1.98)^**

3.64 (2.56–5.17) ^**

Ever been sexually abused

1.17 (0.79–1.74)

Ever been paid to have sex

1.65 (0.79–3.42)

Number of lifetime sexual partners

0.97 (0.89–1.05)

Have a steady partner now

0.56 (0.35–0.90)^*

0.44 (0.25–0.78)^*

Age difference to oldest sexual partner

1.01 (0.98–1.04)

 Age-homogenous (0–4)

1

 Intragenerational (5–9)

1.09 (0.86–1.38)

 Intergenerational (≥ 10)

1.64 (0.98–2.77)

Currently using hormonal contraceptive

16.18 (11.9–22.00)^**

18.28 (12.99–25.74) ^**

Know what an STI is

1.23 (1.00–1.62)

Tested positive for an STI at our clinic^c

1.01 (0.82–1.26)

Tested positive for HIV at our clinic

1.26 (0.95–1.66)

Taking illicit drugs

1.00 (0.58–1.73)

 Current age 16

1.14 (0.67–1.94)

 Current age 17

0.95 (0.75–1.20)

 Current age 18

0.92 (0.77–1.11)

 Current age 19

0.90 (0.75–1.10)

 Current age 20

0.86 (0.70–1.06)