Table 1.

Baseline Characteristics of the Analytic Cohort

	ALTS	CVT	NHS	All
Characteristics	n = 1,903	n = 4,304	n = 939	n = 7,146
Study participants included in analytic cohort	Full study population	Vaccine and control arms; Unvaccinated control group	Active follow-up cohort
Age (years) at enrollment, mean (SD); median (IQR)	25.3 (7.3); 23 (20–27)	22.3 (3.1); 22 (20–24)	34.0 (13.7); 29 (23–41)	24.6 (7.7); 23 (20–26)
Age at first sexual intercourse, mean (SD); median (IQR)	16.3 (2.4); 16 (15–18)	17.2 (2.8); 17 (15–19)	18.0 (3.5); 17 (16–20)	17.1 (2.8); 17 (15–18)
Lifetime number of sexual partners at enrollment, mean (SD); median (IQR)	8.3 (8.6); 5 (3–10)	2.6 (2.5); 2 (1–3)	3.0 (2.9); 2 (1–4)	4.2 (5.5); 2 (1–5)
Time (in years) between age at first intercourse and enrollment, mean (SD), median (IQR)	9.0 (7.1); 7 (4–11)	5.7 (3.7); 5 (3–8)	17.4 (13.8); 14 (7–24)	8.2 (7.9); 6 (4–10)
Incident HPV infections, n	2,636	8,801	1,619	13,056
Prevalent HPV infections among women <30 years, n	3,434	3,426	613	7,473
Carcinogenic HPV infections, n	2,635	7,001	873	10,509
Non-carcinogenic HPV infections, n	3,435	5,226	1,359	10,020

IQR = Interquartile Range; SD = Standard Deviation