Table 3.

8 Studies with median measures of ‘active phase’ duration in systematic review

Trial	Treatment	n	Dilatation at ‘active phase’ onset (cm)a	Median duration (hrs)	Rate of ‘active phase’ dilation (cm/hr)b
Fraser et al, 1993 22	Routine early amniotomy	390	3.8 (0.9)	4.33	1.4
	Conservative membrane management	383	3.8 (0.8)	6.42	1.0
Dickinson et al, 1997 18	Epidural analgesia group	257	4c	4.6	1.3
	Non-epidural group	240	4c	2.75	2.2
Sadler et al, 2000 32	AML group (vaginal delivery)	290	4.5 (1.8)	4.0	1.4
	Routine management (vaginal delivery)	299	4.5 (2.1)	4.83	1.1
Zhang et al, 2001 34	Before ‘on-demand’ epidural analgesia	507	4	6.0	1.0
	After ‘on-demand’ epidural analgesia	581	4	6.0	1.0
Vahratian et al, 2005 38	Spontaneous onset of labor group	1171	4	5.97	1.0
Mikki et al, 2007 39	Early amniotomy	74	3 [3,4]	3.5	2.0
	Intent to conserve membranes	83	4 [3,4]	5.0	1.2
Miquelutti et al, 2007 20	Upright position group	35	4c	6.5	0.9
	Control group	42	4c	5.42	1.1
Svärdby et al, 2007 21	No augmentation	50	4c	5.08	1.2
	Active phase augmentation	88	4c	7.32	0.8
	Second stage augmentation	26	4c	7.33	0.8
	Weighted values	4516	4.0 (0.2)	5.4 (1.0)	1.2 (0.3)

AML = active management of labor

^aGroup mean (SD), median [IQR], or absolute value shown when provided in study.

^bCalculated based on assumption that the cervical dilation phase ends at 10 cm which approximates complete cervical dilatation.

^cThrough contact with author, it was clarified that ‘active phase’ onset was defined as 4 cm dilatation.