Table 4

Results of adjusted logistic regression analysis of the association between sexual behaviours and adolescent pregnancy, 1988–2019.

Survey years1988–19982003–20082011–2019Overall sample (1988–2019)
Population analysed (unweighted)25413350866514 556
Number currently pregnant (unweighted)96117282495
Adjusted odds ratio (95% CI)Adjusted odds ratio (95% CI)Adjusted odds ratio (95% CI)Adjusted odds ratio (95% CI)
Age at first sexP=0.63P=0.79P=0.10P=0.14
 ≤14 years0.85 (0.45 to 1.63)0.91 (0.44 to 1.88)0.63 (0.36 to 1.10)0.75 (0.52 to 1.10)
 ≥15 years1.001.001.001.00
Number of previous sex partnersP=0.03*P=0.79P=0.04*
 10.29 (0.10 to 0.88)0.73 (0.27 to 1.95)0.46 (0.23 to 0.95)
 20.56 (0.21 to 1.52)0.90 (0.31 to 2.58)0.67 (0.33 to 1.36)
 Three or more1.001.001.00
Age of last sexual partnerP=0.02P=0.20P=0.39
 Below 20 years1.001.001.00
 More than 20 years0.14 (0.03 to 0.76)2.00 (0.69 to 5.81)1.46 (0.61 to 3.48)
Knowledge of contraceptionP=0.20P=0.08P=0.02
 Knows no method0.62 (0.30 to 1.29)0.36 (0.11 to 1.15)0.49 (0.27 to 0.90)
 Knows modern or traditional method1.001.001.00
knowledge of fertility period during menstruationP=0.56P=0.45P=0.02P=0.83
 Just before or during menstrual period2.09 (0.50 to 8.67)1.88 (0.70 to 5.05)0.17 (0.04 to 0.69)0.90 (0.45 to 1.77)
 Right after menstrual period or at any time0.95 (0.42 to 2.13)1.24 (0.60 to 2.56)0.51 (0.24 to 1.07)0.87 (0.56 to 1.36)
 Halfway between two menstrual periods1.001.001.001.00
  • *Test for linear trend