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Table 3 Individual-level characteristics and prevalence ratios for the outcome: pregnant women who obtained a syphilis screening

From: Factors associated with HIV and syphilis screenings among pregnant women at first antenatal visit in Lusaka, Zambia

Characteristics Syphilis screened, n = 5196 Syphilis screened, % PR (95% CI) aPRa (95% CI)
Age
 < 20 711 29.0 Ref Ref
 20–34 3940 28.6 0.99 (0.88, 1.11) 0.99 (0.88, 1.11)
 ≥35 545 27.5 0.95 (0.83, 1.09) 0.96 (0.83, 1.12)
Marital status
 Married/with a partner 4638 28.8 Ref Ref
 Single 527 25.9 0.90 (0.73, 1.10) 0.87 (0.71, 1.06)
 Widowed without current partner 23 41.8 1.45 (1.05, 1.99) 1.49 (1.08, 2.05)
 Divorced/separated 8 14.6 0.50 (0.27, 0.95) 0.51 (0.27, 0.96)
Education
 ≤ Primary complete 1806 27.3 Ref Ref
 >Primary complete to ≤ secondary school 2971 29.7 1.09 (0.87, 1.37) 1.09 (0.87, 1.37)
 > Secondary school 419 26.1 0.96 (0.67, 1.36) 0.96 (0.68, 1.36)
History of syphilis infection
 No 5091 28.6 Ref Ref
 Yes 105 26.0 1.10 (0.92, 1.31) 1.09 (0.93, 1.27)
Previous pregnancy
 0 1398 28.9 Ref Ref
 1 1342 28.7 0.99 (0.91, 1.08) 0.97 (0.89, 1.06)
 2 1051 28.6 0.99 (0.91, 1.08) 0.97 (0.89, 1.06)
 3 695 27.8 0.96 (0.84, 1.10) 0.95 (0.83, 1.09)
 ≥ 4 710 27.9 0.96 (0.84, 1.10) 0.97 (0.89, 1.06)
Women with ≥ 1 previous pregnancy n = 3781 % PR (95% CI) aPRa (95% CI)
Previous preterm births
 0 3610 28.2 Ref Ref
 1 143 33.2 0.98 (0.94, 1.02) 0.98 (0.94, 1.03)
 ≥ 2 28 35.4 1.02 (0.98, 1.06) 1.03 (0.98, 1.08)
Previous abortions and/or stillbirths
 0 3146 28.3 Ref Ref
 1 522 29.7 1.02 (1.00, 1.03) 1.02 (1.00, 1.03)
 ≥ 2 113 26.8 0.97 (0.93, 1.01) 0.97 (0.94, 1.01)
  1. aAdjusted prevalence ratio (aPR) and 95% confidence intervals (95% CI) were adjusted for age, marital status, education, history of known syphilis infection, and previous pregnancy
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