. 2021 Jan 28;100(5):971–978. doi: 10.1111/aogs.14042

TABLE 1.

Characteristics of study groups

Variable	High dose of oxytocin (n = 497)	Low dose of oxytocin (n = 511)	P value
Maternal age (years)	29.4 (4.7) 29.0 (26; 32)	29.4 (4.7) 29.0 (26; 32)	.96 ^a
Gestational age (days)	282.0 (7.4) 283.0 (277; 287)	281.6 (6.9) 282.0 (278; 287)	.24 ^a
Epidural anesthesia	432 (86.9)	438 (85.7)	.58 ^b
Cervical dilation at defined delayed labor (cm)	6.97 (2.48) 6.00 (5.00; 9.00) n = 478	6.92 (2.46) 6.00 (5.00; 9.00) n = 501	.75 ^a
Duration of labor (min) From active phase of labor to birth	744 (205) 732 (607; 876) n = 495	773 (198) 762 (639; 899) n = 511	.018 ^a
Maximum dose of oxytocin (mU/min) (µg/min)	30.61 (22.89) 26.67 (13.33; 39.83) 0.05(0.04) 0.04 (0.02; 0.07)	19.50 (11.69) 16.67 (10.00; 26.67) 0.03 (0.02) 0.03 (0.02; 0.04)	<.001 ^a
Total oxytocin dose (mU) (µg)	4816 (5505) 3080 (1620; 5960) 7.92 (8.28) 5.20 (2.70; 10.00) n = 497	3613 (3465) 2540 (1300; 4910) 6.01 (5.75) 4.25 (2.20; 8.23) n = 510	<.001 ^a
Total duration of oxytocin infusion (hr)	4.64 (2.98) 3.90 (2.50; 6.30)	5.29 (3.18) 4.70 (2.90; 7.20)	<.001 ^a
Mode of delivery			.96 ^b
Spontaneous vaginal birth	364 (73.2%)	373 (73.0%)
Instrumental vaginal birth	74 (14.9%)	79 (15.5%)
Cesarean section	59 (11.9%)	59 (11.5%)
Postpartum hemorrhage >1000 mL	67 (13.5%)	72 (14.1%)	.79 ^c
Anal sphincter injury (grade 3 or 4) ^d	23 (5.3%) n = 438	23 (5.1%) n = 452	1.00 ^c
Birthweight (g)	3662 (441) 3650 (3340; 3961)	3628 (428) 3605 (3330; 3900)	.24 ^a
Apgar score 5 min < 4	1 (0.2%)	0 (0.0%)	1.00 ^c
Apgar score 5 min < 7	4 (0.8%)	9 (1.8%)	.26 ^c
Admission to neonatal intensive care unit (NICU)	39 (7.8%)	37 (7.2%)	.72 ^c

For categorical variables, n (%) is given.

For continuous variables, mean (SD)/median (Q1; Q3)/ n = is given.

^{^a}

Mann‐Whitney U test.

^{^b}

Chi‐square test.

^{^c}

Fisher’s Exact test.

^{^d}

Percentage of vaginal deliveries.