Table II.

Characteristics of women ages 15–53 years at Index ECG (N=410,782).

	Women with no OC prescription	Women with OC prescription	p-value
Number	376,106	34,676
Age, years (mean ± SD)	40.7 ± 10.2	33.2 ± 9.6	<0.0001
Age Categories, n (%)			<0.0001
15 – 20	23,841 (6.3)	4,016 (11.6)
21 – 25	19,967 (5.3)	54,84 (15.8)
26 – 30	27,669 (7.4)	6,038 (17.4)
31 – 35	37,228 (9.9)	5,562 (16.0)
36 – 40	51,075 (13.6)	4,926 (14.2)
41 – 45	71,144 (18.9)	4,608 (13.3)
46 – 50	87,987 (23.4)	3,346 (9.7)
51 – 53	38,409 (10.2)	555 (1.6)
Race, n (%)			<0.0001
White	154,193 (41.0)	16,462 (47.5)
Black	35,516 (9.4)	2,263 (6.5)
Asian & Pacific Islander	44,486 (11.8)	3,100 (8.9)
Latino	55,911 (14.9)	4,907 (14.2)
Native American	2,265 (0.6)	152 (0.4)
Mixed	5,874 (1.6)	456 (1.3)
Missing	77,861 (20.7)	7,336 (21.2)
Number of ECGs (mean ± SD)	1.9 ± 2.1	1.6 ± 1.3	<0.0001
QTc at the index ECG, ms (mean ± SD)	403.5 ± 22.6	400.8 ± 21.3	<0.0001
Number of follow-up years (mean± SD)	4.9 ± 3.6	4.5 ± 3.1	<0.0001
Smoking status, n (%)			<0.0001
Never	159,590 (42.4)	17,232 (49.7)
Former	32,449 (8.6)	2,989 (8.6)
Current	72,831 (19.4)	5,257 (15.2)
Missing	111,236 (29.6)	9,198 (26.5)
Comorbidities, n (%)
Acute coronary syndrome	2,915 (0.8)	71 (0.2)	<.0001
Cardiac Arrest	261 (0.1)	6 (0.02)	0.0003
Transient Ischemic Attack	1790 (0.5)	67 (0.2)	<.0001
Hemorrhagic Stroke	613 (0.2)	18 (0.1)	<.0001
Ischemic Stroke	1782 (0.5)	47 (0.1)	<.0001
Heart failure	2,857 (0.8)	84 (0.2)	<.0001
Ventricular dysrhythmias	789 (0.2)	52 (0.2)	0.0184
Obesity	96,753 (25.7)	7,536 (21.7)	<.0001
Hypertension	76,789 (20.4)	3,918 (11.3)	<.0001
Diabetes	5,805 (1.5)	142 (0.4)	<.0001
Hyperlipidemia	35,045 (9.3)	1,635 (4.7)	<.0001
End-stage renal disease	1,138 (0.3)	30 (0.1)	<.0001

ECG = electrocardiogram