. Author manuscript; available in PMC: 2016 Oct 1.

Published in final edited form as: Am J Obstet Gynecol. 2015 Oct;213(4 0):S29–S52. doi: 10.1016/j.ajog.2015.08.040

Table 2.

Frequency of chorioamnionitis according to gestational age at delivery

Weeks of gestation	Chorioamnionitis (n)	Total number of patients	Percent (%)
21–24	17	18	94.4
25–28	19	48	39.6
29–32	34	96	35.4
33–36	53	497	10.7
37–40	233	6139	3.8
41–44	36	707	5.1
Total	392	7505	5.2

Modified from Russell P, Inflammatory lesions of the human placenta I, The American journal of diagnostic gynecology and obstetrics 1979; 1: 127-137