Table 1.

Baseline Characteristics for Patients With PCOS and Controls

Baseline Characteristic	Study Arm				P
	PCOS		Non-PCOS
No. of patients	9068		18 136
Followup (y), mean, sd	4.2	3.3	4.2	3.3	1.000
Observation period pre-index (y), mean, sd	5.3	3.7	6.5	3.8	<.001
Age (y), mean, sd	27.3	6.4	27.3	6.4	.808
Ethnicity
Bangladeshi, n, %	27	0.3	60	0.3	<.001
Black (African/Caribbean/Other), n, %	174	1.9	331	1.8
Chinese, n, %	13	0.1	22	0.1
Indian, n, %	173	1.9	173	1.0
Mixed, n, %	52	0.6	100	0.6
Other Asian, n, %	77	0.8	83	0.5
Other, n, %	103	1.1	202	1.1
Pakistani, n, %	143	1.6	160	0.9
Unknown/not recorded, n, %	2990	33.0	6701	36.9
White, n, %	5316	58.6	10 304	56.8
Primary care contacts in previous year	9.0	7.8	7.6	7.0	<.001
Prescribed oral contraception ± 90 d of index date, n, %	2712	29.9	6508	35.9	<.001
History of assisted reproduction, n, %	413	4.6	188	1.0	<.001
BMI (kg/m2), mean, sd	27.7	6.4	27.5	6.3	.019
Underweight (< 18 kg/m2), n, %	187	2.1	283	1.6	<.001
Normal (18–25 kg/m2), n, %	3543	39.1	7581	41.8
Overweight (> 25–30 kg/m2), n, %	2330	25.7	4543	25.0
Obese (> 30–40 kg/m2), n, %	2637	29.1	5013	27.6
Extremely obese (> 40 kg/m2), n, %	371	4.1	716	3.9
BP
No. with BP recorded, n, %	5378	59.3	15 529	85.6
Systolic BP (mm Hg), mean, sd	118.7	13.5	118.3	13.0	.046
Diastolic BP (mm Hg), mean, sd	74.8	9.7	73.5	9.6	<.001
Hypertensive, n, %	362	6.7	879	5.7	.001
Smoking status					<.001
Never smoked, n, %	5159	56.9	9590	52.9
Ex-smoker, n, %	1511	16.7	3439	19.0
Current smoker, n, %	2364	26.1	5065	27.9
Not recorded, n, %	34	0.4	42	0.2

Abbreviation: BP, blood pressure.