RESULTS	The following variables were significantly associated with clinical chorioamnionitis : ( 1 ) number of digital vaginal examinations : > 8 , 7 to 8 , 5 to 6 , 3 to 4 ( vs 0 to 2 ) ( odds ratio 5.07 , 3.80 , 2.62 , 2.06 ) ; ( 2 ) duration of active labor : > or = 12 , 9 to < 12 , 6 to < 9 hours ( vs < 3 hours ) ( odds ratio 4.12 , 2.94 , 1.97 ) ; ( 3 ) meconium-stained amniotic fluid ( odds ratio 2.28 ) ; ( 4 ) parity of 0 ( odds ratio 1.80 ) ; ( 5 ) time from membrane rupture to active labor : > or = 48 , 24 to < 48 hours ( vs < 12 hours ) ( odds ratio 1.76 , 1.77 ) ; and ( 6 ) group B streptococcal colonization ( odds ratio 1.71 ) .\