Table 7.

Maternal risk factors: Comparison to previous studies

Risk factor	Present study: N=415	Previous studies
Premature rupture of Membranes	38.1%	Premature rupture occurs in 8% or less of term pregnancy (ACOG 2007 [43]
Rupture of membranes duration	• Mean ROM duration: 18.18 hours • ROM >18 hours: 31.6%	ROM 19.7 hr (Soper et al. 1989 [44]) ROM>18hours has RR 6.9 for IAI (Rickert et al.1998 [45])
Duration of labor labor (Onset of regular contraction to delivery)	Mean duration: 13.44 hours >15 hours: 33.7%	20.9 hours (Soper et al. 1989 [44] Labor duration >15 hours has a RR of 4 for CA (Seaward et al. [38]
Meconium-stained fluid	25.3%	33% (Romero R et al. 1991 [46] 21% (Tran et al. 2003 [39] 11.5% (Venkatesh et al. 2019 [47]
Labor induction	35.9%	45% (Cohill et al. 2012 [48]) 9% (Rikert et al. 1998 [45]) 47.8 % (Venkatesh et al. 2019 [47])
Number of vaginal examinations	Mean no: 5.79	6.1 (Soper et al. 1989 [44])
GBS carrier state	20.7%	18.8% (Venkatesh et al. 2019 [49]) 11% (Shahni et al. 2019 [50])
Nulliparity	71.8%	48% (Cohill et al. 2012 [48]) 70.6% (Venkatesh et al. 2019 [47])

ACOG American College of Obstetricians and Gynecologists, ROM Rupture of membranes, CA Chorioamnionitis, GBS Group B streptococcus