Table 1.

Descriptive characteristics^* of women choosing simultaneous or interval administration of mifepristone and misoprostol for early medical abortion from 1 May 2015 to 30 April 2016 at British Pregnancy Advisory Service (N=28,901)

Characteristic	Simultaneous (n=24,543)	Interval (n=4,358)	p-value †
Age (Years)
Mean ± standard deviation	27.0±6.6	26.8±6.7	0.028
Body Mass Index (kg/m2)			0.551
Underweight (≤18.5)	7.4 (1,821)	7.6 (330)
Normal (18.5–24.9)	50.8 (12,459)	50.7 (2,221)
Overweight (25.0–29.9)	25.6 (6,285)	24.8 (1,081)
Obese (≥30.0)	16.2 (3,978)	16.9 (736)
Race or Ethnicity			<0.001
White	77.9 (19,115)	74.0 (3,227)
Asian	8.6 (2,100)	11.7 (510)
Black	6.2 (1,532)	7.1 (310)
Other	5.4 (1,322)	5.7 (247)
Not Reported	1.9 (474)	1.5 (64)
Previous Abortions			<0.001
0	62.8 (15,407)	67.8 (2,953)
1 or more	37.2 (9,136)	32.2 (1,405)
Previous Births			<0.001
0	47.0 (11,526)	53.5 (2,330)
1 or more	53.0 (13,017)	46.5 (2,028)
Previous Cesarean Sections			0.045
0	88.3 (21,680)	89.4 (3,896)
1 or more	11.7 (2,863)	10.6 (462)
Previous Miscarriages			<0.001
0	82.2 (20,179)	84.7 (3,691)
1 or more	17.8 (4,364)	15.3 (667)
Gestational Age (Days)			<0.001
≤ 49	57.1 (14,016)	46.0 (2,005)
50 – 56	25.8 (6,321)	30.2 (1,316)
57 – 63	17.1 (4,206)	23.8 (1,037)
Median ± IQR	48±11	50±11	<0.001

^*Results presented as % (n) unless noted.

^†Excluding means and standard deviations, p-values are for chi-squared tests for characteristics; null hypothesis is that the joint distribution of the counts in the contingency tables is the product of row and column marginal distributions. For means and standard deviations, p-values are for t-tests to compare treatment versus control group means; null hypothesis is that groups have equal means. For gestational age, the p-value is for a Mann-Whitney test.