The Association between Early Artificial Amniotomy and Chorioamnionitis in Nulliparous Induction of Labor
Table 3
Association between demographic variables and chorioamnionitis.
Variable
Chorioamnionitis
No chorioamnionitis
value*
= 189
= 1,333
Maternal age, yr
22 (19–28)
22 (19–29)
0.50
African American race, (%)
52 (28.9)
341 (27.4)
0.67
Chronic hypertension or preeclampsia, (%)
55 (29.1)
403 (30.2)
0.75
Pregestational or gestational diabetes, (%)
6 (3.2)
76 (5.7)
0.15
Obesity, (%)
11 (5.8)
121 (9.1)
0.13
HIV, (%)
0
0
Lupus, (%)
0
2 (0.15)
1.0
Smoking, (%)
3 (1.6)
27 (2.0)
1.0
Location of prenatal care, (%)
Private practice
110 (60.1)
857 (65.6)
0.03
Medicaid practice
64 (35.0)
423 (32.4)
No prenatal care
9 (4.9)
26 (2.0)
Gestational age at delivery, wk
40.1 (39.0–41.1)
40.0 (39.0–41.0)
0.07
Neonatal weight, gms
3248 (2856–3584)
3304 (2940–3528)
0.75
Indication for induction, (%)
Maternal
66 (34.9)
504 (37.8)
0.59
Fetal
121 (64.0)
821 (61.6)
Both
2 (1.1)
8 (0.6)
Method of induction, (%)
Pitocin
157 (83.1)
1,097 (82.3)
0.79
Prostaglandin
97 (51.3)
677 (51.0)
0.93
Foley bulb
39 (20.6)
247 (18.6)
0.50
Multiple methods
102 (54.0)
706 (53.2)
0.84
Any cervical ripening
115 (60.9)
832 (62.7)
0.63
Epidural anesthesia, (%)
183 (97.3)
1,267 (93.6)
0.04
Maternal GBS positive, (%)
53 (29.8)
441 (35.5)
0.14
Number of vaginal exams, (%)
8 (6–10)
8 (6–11)
0.12
Meconium stained amniotic fluid, (%)
43 (22.5)
238 (17.5)
0.10
Fetal scalp electrode, (%)
67 (35.5)
489 (36.7)
0.74
Intrauterine pressure catheter, (%)
82 (43.4)
658 (49.4)
0.12
Year of delivery, (%)
2008
50 (26.5)
306 (23.0)
0.71
2009
40 (21.2)
318 (23.9)
2010
46 (24.3)
333 (25.0)
2011
53 (28.4)
373 (28.0)
Categorical data analyzed with chi-square tests and data reported as (%). Continuous data analyzed with nonparametric comparison of medians and reported as median (interquartile range).
