Table 7 Maternal risk factors: Comparison to 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])