Table 3.

Comparison of contraction parameters in cases and controls

	Adverse neonatal outcome* n= 183	Absence of adverse neonatal outcome* n= 2172	OR (95% CI)	p	aOR (95% CI)	p
Frequency
Average contraction frequency	4.3 +/− 1.1	4.2 +/− 1.0	-	0.26	-	-
% of women with >5 contractions/10 minutes†	39 (21.3)	331 (15.2)	1.51 (1.01–2.21)	0.03	1.62 (1.11–2.37)	0.01
% of women with ≥5 contractions/10 minutes†	63 (34.4)	553 (25.5)	1.54 (1.10–2.14)	0.01	1.64 (1.18–2.27)	<0.01
% of women with ≥4 contractions/10 minutes†	118 (64.5)	1469 (68.9)	0.82 (0.59–1.14)	0.22	0.90 (0.65–1.24)	0.51
Duration
Average duration of contractions (sec)	81 +/− 13	83 +/− 13	-	0.16	-	-
Relaxation time
Average relaxation time (total sec in 10 min)	283 +/− 102	271 +/− 88	-	0.08	-	-
Montevideo units (mmHg)
Average Montevideo units	200 +/− 89	208 +/− 87	-	0.22	-	-
% of women with average Montevideo units ≤200†	95 (41.9)	997 (45.9)	1.27 (0.93–1.73)	0.12	1.21 (0.89–1.65)	0.22
% of women with average Montevideo units >300‡	27 (14.8)	306 (14.1)	1.06 (0.66–1.63)	0.80	1.02 (0.66–1.57)	0.92
Baseline tone (mmHg)
Average baseline uterine tone +/− SD	24.7 +/− 8.4	23.6 +/− 8.1	-	0.08	-	-
% of women with average baseline tone > 20 mmHg†	130 (71.0)	1431 (65.9)	1.27 (0.90–1.81)	0.16	1.23 (0.88–1.72)	0.23

^*Data presented as n (%) except continuous variables which are presented as mean +/− standard deviation

^†Adjusted for oxytocin use, nulliparity, and mode of delivery

^‡Adjusted for nulliparity, and mode of delivery