Distribution of rubella IgG antibodies in relation to the reproductive history of pregnant women
| Variables | Descriptive data n (%) 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.
AOR, adjusted OR.