Table 1 Demographics and Characteristics of Mothers and Babies Stratified by Chorioamnionitis - n%
Characteristic | Total (N = 9,034,428) | Chorioamnionitis (N = 116,627) | No chorioamnionitis(N = 8,917,801) | p-Value | Unknown |
|---|---|---|---|---|---|
Neonatal Death | 5794 (0.1) | 106 (0.1) | 5688 (0.1) | 0.0003 | |
Early Death | 3391 (0.0) | 71 (0.1) | 3320 (0.0) | < 0.001 | |
Late Death | 2403 (0.0) | 35 (0.0) | 2368 (0.0) | 0.4720 | |
Admission to NICU | 339,942 (3.8) | 29,488 (25.3) | 310,454 (3.5) | <.0001 | 5414 (0.1) |
Mother’s Age Category (years) | <.0001 | ||||
< 20 | 691,055 (7.6) | 13,310 (11.4) | 677,745 (7.6) | ||
20–24 | 2,096,978 (23.2) | 31,111 (26.7) | 2,065,867 (23.2) | ||
25–29 | 2,614,045 (28.9) | 33,249 (28.5) | 2,580,796 (28.9) | ||
30–34 | 2,328,649 (25.8) | 26,609 (22.8) | 2,302,040 (25.8) | ||
35–39 | 1,056,573 (11.7) | 10,137 (8.7) | 1,046,436 (11.7) | ||
> = 40 | 247,128 (2.7) | 2211 (1.9) | 244,917 (2.7) | ||
Pre-pregnancy Body Mass Index (kg/m2) | <.0001 | 36,428 (4) | |||
Underweight < 18.5 | 330,184 (3.7) | 4023 (3.4) | 326,161 (3.7) | ||
Normal 18.5–24.9 | 4,101,894 (45.4) | 57,298 (49.1) | 4,044,596 (45.4) | ||
Overweight 25.0–29.9 | 2,209,657 (24.5) | 29,045 (24.9) | 2,180,612 (24.5) | ||
Obesity I 30.0–34.9 | 1,141,225 (12.6) | 13,188 (11.3) | 1,128,037 (12.6) | ||
Obesity II 35.0–39.9 | 530,684 (5.9) | 5453 (4.7) | 525,231 (5.9) | ||
Extreme Obesity III > =40 | 356,516 (3.9) | 3263 (2.8) | 353,253 (4.0) | ||
Mother’s Education | <.0001 | 101,440 (1.1) | |||
Primary / High School | 1,489,421 (16.5) | 16,434 (14.1) | 1,472,987 (16.5) | ||
Undergraduate | 4,108,603 (45.5) | 52,287 (44.8) | 4,056,316 (45.5) | ||
Academic Degree | 2,392,987 (26.5) | 32,652 (28.0) | 2,360,335 (26.5) | ||
Doctorate or Professional Degree | 941,977 (10.4) | 13,867 (11.9) | 928,110 (10.4) | ||
Marital Status | 5,436,538 (60.2) | 64,979 (55.7) | 5,371,559 (60.2) | <.0001 | |
Mother’s Race | <.0001 | ||||
White | 6,988,814 (77.4) | 83,482 (71.6) | 6,905,332 (77.4) | ||
Black | 1,353,358 (15.0) | 17,532 (15.0) | 1,335,826 (15.0) | ||
American Indian / Alaskan Native | 93,982 (1.0) | 1058 (0.9) | 92,924 (1.0) | ||
Asian / Pacific Islander | 598,274 (6.6) | 14,555 (12.5) | 583,719 (6.5) | ||
Resident Status | 6,627,740 (73.4) | 87,787 (75.3) | 6,539,953 (73.3) | <.0001 | |
Nulliparous | 3,639,997 (40.3) | 94,060 (80.7) | 3,545,937 (39.8) | <.0001 | 389,941 (4.3) |
Smoker | 718,229 (7.9) | 5415 (4.6) | 712,814 (8.0) | < 0.001 | 511,070 (5.7) |
Chronic Hypertension | 112,002 (1.2) | 1440 (1.2) | 110,562 (1.2) | 0.8660 | 9224 (0.1) |
Pregnancy Associated Hypertension | 349,609 (3.9) | 6802 (5.8) | 342,807 (3.8) | <.0001 | 9224 (0.1) |
Diabetes (overall) | 494,901 (5.5) | 7103 (6.1) | 487,798 (5.5) | <.0001 | 9224 (0.1) |
Pre-pregnancy Diabetes | 57,013 (0.6) | 685 (0.6) | 56,328 (0.6) | 0.0566 | 9224 (0.1) |
Gestational Diabetes | 437,888 (4.8) | 6418 (5.5) | 431,470 (4.8) | <.0001 | 9224 (0.1) |
Month Prenatal Care Began | <.0001 | 300,509 (3.3) | |||
1st to 3rd month | 6,474,810 (71.7) | 85,726 (73.5) | 6,389,084 (71.6) | ||
4th to 6th month | 1,744,616 (19.3) | 21,724 (18.6) | 1,722,892 (19.3) | ||
7th to final month | 408,509 (4.5) | 5174 (4.4) | 403,335 (4.5) | ||
No prenatal care | 105,984 (1.2) | 948 (0.8) | 105,036 (1.2) | ||
Meconium-stained amniotic fluid | 491,605 (5.4) | 20,313 (17.4) | 471,292 (5.3) | <.0001 | |
Tocolysis | 55,479 (0.6) | 1281 (1.1) | 54,198 (0.6) | <.0001 | 13,226 (0.1) |
Induction of Labor | 2,221,042 (24.6) | 37,531 (32.2) | 2,183,511 (24.5) | <.0001 | |
Final Route and Method of Delivery | <.0001 | 4106 (0.0) | |||
Spontaneous | 5,976,036 (66.1) | 61,161 (52.4) | 5,914,875 (66.3) | ||
Forceps | 58,786 (0.7) | 2529 (2.2) | 56,257 (0.6) | ||
Vacuum | 270,410 (3.0) | 8732 (7.5) | 261,678 (2.9) | ||
Cesarean | 2,725,090 (30.2) | 44,186 (37.9) | 2,680,904 (30.1) | ||
Gestational Age (weeks) | <.0001 | ||||
37 | 825,690 (9.1) | 7647 (6.6) | 818,043 (9.2) | ||
38 | 1,667,050 (18.5) | 16,174 (13.9) | 1,650,876 (18.5) | ||
39 | 3,078,494 (34.1) | 32,304 (27.7) | 3,046,190 (34.2) | ||
40 | 2,025,919 (22.4) | 33,690 (28.9) | 1,992,229 (22.3) | ||
41 and over | 1,437,275 (15.9) | 26,812 (23.0) | 1,410,463 (15.8) | ||
Birth Weight Category (g) | <.0001 | ||||
< 2500 | 237,523 (2.6) | 1740 (1.5) | 235,783 (2.6) | ||
2500–3999 | 7,994,850 (88.5) | 101,877 (87.4) | 7,892,973 (88.5) | ||
> 4000 | 802,055 (8.9) | 13,010 (11.2) | 789,045 (8.8) | ||
Sex of Infant | <.0001 | ||||
Female | 4,434,570 (49.1) | 55,583 (47.7) | 4,378,987 (49.1) | ||
Male | 4,599,858 (50.9) | 61,044 (52.3) | 4,538,814 (50.9) |