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Table 1 Maternal characteristics of women with and without bacterial vaginosis during pregnancy, Washington State 2003-2013

From: Bacterial vaginosis and adverse outcomes among full-term infants: a cohort study

  Full Term (N = 11,354) Preterm (N = 975) Total (N = 12,340)
BV exposed BV unexposed BV exposed BV unexposed BV exposed BV unexposed
N = 2198 N = 9156 N = 267 N = 708 N = 2468 N = 9872
  n % n % n % n % n % n %
Age (years)*
 <20 324 14.7 666 7.3 39 14.6 56 7.9 363 14.7 723 7.3
 20-24 784 35.7 2095 22.9 79 29.6 179 25.3 866 35.1 2278 23.1
 25-29 620 28.2 2593 28.3 66 24.7 166 23.5 686 27.8 2760 28.0
 30-34 317 14.4 2375 26.0 44 16.5 188 26.6 361 14.6 2564 26.0
 35+ 153 7.0 1424 15.6 39 14.6 119 16.8 192 7.8 1544 15.6
Race/Ethnicity*
 White 1268 58.8 6842 71.7 152 58.9 497 71.8 1422 58.8 6981 71.7
 Black 231 10.7 416 4.6 21 8.1 36 5.2 252 10.4 452 4.6
 Asian 183 8.5 939 10.4 28 10.9 64 9.3 212 8.8 1006 10.3
 Hispanic 410 19.0 979 10.8 39 15.1 73 10.6 449 18.6 1054 10.8
 Native American 62 2.9 218 2.4 18 7.0 22 3.2 80 3.3 240 2.5
 Other 4 0.2 9 0.1 0 0.0 0 0.0 4 0.2 9 0.1
Education*
 Less than H.S. 689 31.6 1639 18.1 89 34.1 148 21.4 779 31.9 1791 18.4
 H.S. grad/some college 1132 51.9 4134 45.8 129 49.4 323 46.6 1263 51.7 4460 45.8
 College graduate 360 16.5 3263 36.1 43 16.5 222 32.0 403 16.5 3486 35.8
Nulliparous* 3733 47.2 1035 41.4 118 45.2 309 45.2 1154 47.0 4045 41.7
Cesarean delivery* 477 21.7 2479 27.1 78 29.3 269 38.1 555 22.5 2751 27.9
Low Birth Weight (<2500 g)* 41 1.9 139 1.5 158 60.1 344 49.1 199 8.1 483 4.9
Small for gestational age 227 10.3 790 8.6 22 8.2 76 10.7 249 10.1 866 8.8
 missing 0 (0) 12 (0.13) 20 (7.49) 15 (2.12) 23 (0.93) 35 (0.35)
Smoking* 360 16.5 921 10.1 42 15.9 84 12.0 404 16.5 1006 10.3
Kotelchuck Index
 Inadequate 374 17.8 1203 15.2 29 14.2 85 16.7 403 17.5 1291 15.3
 Intermediate 475 22.6 1763 22.3 39 19.1 76 14.9 514 22.3 1839 21.8
 Adequate 899 42.7 3658 46.3 52 25.5 150 29.5 951 41.2 3808 45.2
 Adequate Plus 356 16.9 1283 16.2 84 41.2 198 38.9 440 19.1 1481 17.6
 missing 94 (4.3) 1249 (13.6) 63 (23.6) 199 (28.1) 160 (6.5) 1453 (14.7)
STI*† 296 13.5 379 4.1 34 12.7 42 5.9 330 13.4 422 4.3
Maternal comorbidities‡ 236 10.8 1022 11.3 53 20.0 184 26.3 289 11.7 1207 12.4
 missing 2 (0.1) 92 (1.0) 2 (0.8) 7 (1.0) 5 (0.2) 99 (1.0)
Chorioamnionitis* 62 2.8 265 2.9 22 8.2 41 5.8 84 3.4 306 3.1
Meconium (moderate/heavy) 198 9.0 510 5.6 6 2.3 19 2.7 204 8.3 530 5.4
 missing 4 (0.2) 98 (1.1) 20 (7.5) 26 (3.7) 25 (1.0) 126 (1.3)
  1. BV bacterial vaginosis; H.S. High School, STI sexually transmitted infections
  2. *Missing data not displayed, <3.5 % in all groups
  3. †syphilis, gonorrhea, chlamydia, and/or genital herpes
  4. ‡hypertension, diabetes, and/or pre-eclampsia