Table 1 Comparison of maternal characteristics, antenatal care, and syphilis history between pregnant women in syphilis discordant and concordant couples (n, %)
Characteristics | Syphilis discordant (n1 = 2419) | Syphilis concordant(n2 = 657) | χ2 | P |
|---|---|---|---|---|
Maternal age | ||||
  < 25 | 590 (24.4) | 180 (27.4) | 3.81 | 0.28 |
 25–29 | 918 (37.9) | 239 (36.4) | ||
 30–34 | 552 (22.8) | 154 (23.4) | ||
  ≥ 35 | 359 (14.8) | 84 (12.8) | ||
Ethnic group | ||||
 Han | 2261 (93.5) | 604 (91.9) | 1.91 | 0.17 |
 Minority | 158 (6.5) | 53 (8.1) | ||
Education | ||||
 College | 252 (10.4) | 70 (10.7) | 0.36 | 0.84 |
 Middle school | 1836 (75.9) | 493 (75.1) | ||
 Primary | 318 (13.1) | 92 (14.0) | ||
 Unknown | 13 (0.5) | 2 (0.3) | ||
Occupation | ||||
 Farmer | 689 (28.5) | 187 (28.5) | 6.15 | 0.05 |
 Fix employed | 555 (22.9) | 178 (27.1) | ||
 Unemployed | 1089 (45.0) | 266 (40.5) | ||
 Unknown | 86 (3.6) | 26 (4.0) | ||
Marriage | ||||
 Married | 2272 (93.9) | 622 (94.7) | 0.52 | 0.47 |
 Others | 147 (6.1) | 35 (5.3) | ||
Gravidity | ||||
 1 | 465 (19.2) | 115 (17.5) | 3.74 | 0.15 |
 2 | 735 (30.4) | 183 (27.9) | ||
  ≥ 3 | 1219 (50.4) | 359 (54.6) | ||
Parity | ||||
 0 | 1301 (53.8) | 287 (43.7) | 33.01 | < 0.001 |
 1 | 921 (38.1) | 276 (42.0) | ||
  ≥ 2 | 197 (8.1) | 94 (14.3) | ||
Number of children | ||||
 0 | 1364 (56.4) | 315 (47.9) | 21.61 | < 0.001 |
 1 | 907 (37.5) | 275 (41.9) | ||
  ≥ 2 | 148 (6.1) | 67 (10.2) | ||
First ANC gestational week | ||||
  ≤ 12 | 1350 (55.8) | 331 (50.4) | 19.54 | < 0.001 |
 13–27 | 854 (35.3) | 230 (35.0) | ||
  ≥ 28 | 215 (8.9) | 96 (14.6) | ||
Previous syphilis infection | ||||
 No | 1219 (50.4) | 320 (48.7) | 0.59 | 0.44 |
 Yes | 1200 (49.6) | 337 (51.3) | ||
Diagnose of syphilis infection | ||||
 During pregnancy | 2265 (93.6) | 589 (89.6) | 13.38 | < 0.001 |
 At delivery | 139 (5.8) | 64 (9.7) | ||
 Before pregnancy | 15 (0.6) | 4 (0.6) | ||
Syphilis stage | ||||
 latent | 2090 (86.4) | 519 (79.0) | 21.19 | < 0.001 |
 I | 83 (3.4) | 40 (6.1) | ||
 II | 12 (0.5) | 7 (1.1) | ||
 III | 4 (0.2) | 5 (0.8) | ||
 Unknown | 230 (9.5) | 86 (13.1) | ||
TRUST/RPR titers | ||||
  ≤ 1:8 | 2327 (96.2) | 614 (93.5) | 9.26 | 0.002 |
  > 1:8 | 92 (3.8) | 43 (6.5) | ||