Table 2

Distribution of rubella IgG antibodies in relation to the reproductive history of pregnant women

 Variables Descriptive datan (%) tested Rubella seroprevalence Univariable logistic regression Multivariable logistic regression IgG-negative, n (%) IgG-positive, n (%) χ2 test OR (95% CI) P value AOR (95% CI) P value Gestational age (days) Mean±SD=143.5±29.8 Minimum–maximum=12–189 Median (IQR)=147 (126–168) First trimester 50 (10) 4 (8.2) 45 (91.8) 0.28 0.5 (0.1 to 1.5) 0.236 Second trimester 452 (90) 63 (14.4) 363 (85.6) Age group (years) 17–24 116 (23.1) 8 (7.5) 98 (92.5) 25–34 263 (52.4) 37 (14.8) 213 (85.2) 0.015 0.4 (0.2 to 1) 0.065 0.6 (0.2 to 1.4) 0.254 35–44 120 (23.9) 20 (17.2) 96 (82.8) 0.3 (0.1 to 0.9) 0.034 0.5 (0.2 to 1.3) 0.202 Parity Primiparous 145 (29) 10 (7.5) 124 (92.5) 0.01 Multiparous 357 (71) 57 (16.7) 284 (83.3) 2.4 (1.2 to 4.9) 0.013 2 (0.9 to 4.2) 0.07 Gestation 1 94 (19) 6 (7.2) 77 (92.8) 2–3 296 (59) 39 (13.8) 244 (86.2) 0.04 0.4 (0.2 to 1.2) 0.129 >3 112 (22) 22 (20.2) 87 (79.8) 0.3 (0.1 to 0.8) 0.021 History of abortion None 377 (75) 47 (13.2) 308 (86.8) 0.36 ≥1 125 (25) 20 (16.7) 100 (83.3) 0.7 (0.4 to 1.4) 0.422 Caesarean antecedent None 417 (83) 52 (13.2) 343 (86.8) Once 68 (14) 13 (20) 52 (80) 0.48 0.5 (0.2 to 1.1) 0.12 ≥2 17 (3) 2 (15.4) 13 (85) 0.9 (0.2 to 4.3) 0.948 Embryo-fetopathy antecedent Yes 30 (6) 5 (17.2) 24 (82.8) 0.58 0.7 (0.2 to 2.0) 0.577 No 472 (94) 62 (13.9) 384 (86.1) Ultrasound abnormalities Not done 114 (22.7) 18 (16.8) 89 (83.2) 0.58
• AOR: OR adjusted by multiple logistic regression analysis of the variables age and parity.