Table 1.

Baseline characteristics of the study population

	Chlamydia trachomatis positive at day 1 (N=354)	C trachomatis negative at day 1 (N=8087)
Mean age (years) ±SD	20.2±2.0	20.0±2.1
Age at first sexual intercourse ±SD (among non-virgins)	16.5±1.8	16.7±1.9
Median lifetime number of sexual partners (IQR)	2 (2–3)	2 (1–3)
Current smoker	116/354 (32.8%)	2166/8087 (26.8%)
Any squamous intraepithelial neoplasia present*	69/337 (20.5%)	860/7854 (10.9%)
Positive (by PCR) to ≥1 of 14† tested HPV types	208/354 (58.8%)	2540/8087 (31.4%)
Positive (by PCR) to ≥1 of 12‡ tested hrHPV types	204/354 (57.6%)	2425/8087 (30.0%)
Positive (by PCR) to HPV16 and/or 18	81/354 (22.9%)	884/8087 (10.9%)

^*Denominator includes only those women with a satisfactory day 1 Pap test result.

^†Includes HPV6, 11, 16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58 and 59.

^‡Includes HPV16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58 and 59.

hrHPV, high-risk HPV.