TABLE 2.

Baseline maternal characteristics

Baseline characteristics	Trial	Oral progesterone	Placebo
Maternal age, ya	Ashoush et al, 2017	29.3±4.5	29.5±3.5
	Glover etal, 2011	29.3±4.7	27.2±4.9
	Rai et al, 2009	26.07±3.24	25.72±3.42
Mean gestational age at randomization, wka	Ashoush et al, 2017b	15.21 ±0.98	15.31 ±0.97
	Glover etal, 2011	16.9±2.6	18.2±2.7
	Rai et al, 2009	20.69±2.83	20.73±1.78
Race (not white), %	Ashoush et al, 2017b	100 % (all North African)	100 % (all North African)
	Glover etal, 2011	42.1	50
	Rai et al, 2009b	100% (all South Asian	100% (all South Asian)
Previous preterm births, na	Ashoush et al, 2017	1.65±0.63	1.72±0.65
	Glover etal, 2011	2.2±1.2	1.5±0.9
	Rai et al, 2009	1.21 ±0.53	1.31 ±0.52
Baseline cervical length, mma	Ashoush et al, 2017	25.7±8.3	23.9±9.7
	Glover etal, 2011	34.9±6.9	34.0±4.5
	Rai et al, 2009b	28.99± 3.751	26.93±3.489
Cerclage, n (%)	Ashoush et al, 2017	70 (72.9)	73 (80.2)
	Glover etal, 2011	0	0
	Rai et al, 2009b	2(3)	3(4)

^aData are given as mean±standard deviation

^bIndicates unpublished data provided by authors.