Table 1.

Cohort members’ demographic information.

		All	Male	Female
Total cohort size (N)		47,970	20,325	27,645
Gender (%)		–	42.4	57.6
Median age (IQR)		30 (20,42)	32 (22,43)	28 (19,41)
Patients with less than 1 year of follow-up:
Number of patients (% of Total N)		6470 (13.5)	3142 (15.5)	3328 (12.0)
Gender (row %)		–	48.6	51.4
Median age (IQR)		31 (21,42)	34 (24,45)	27 (19,39)
Lost to follow-up (% of Total N):
	Died from any cause	2.1	3.8	0.9
	Transferred out of practice	9.3	9.7	9.0
	Practice no longer contributing to CPRD	2.1	1.9	2.2
Patients with complete 1 year of follow-up:
Number of patients (% of Total N)		41,500 (86.5)	17,183 (84.5)	24,317 (88.0)
Gender (row %)		–	41.4	58.6
Median age (IQR)		30 (20,42)	31 (22,43)	29 (19,42)