. Author manuscript; available in PMC: 2011 Oct 1.

Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2010 Jul 29;19(10):2469–2478. doi: 10.1158/1055-9965.EPI-10-0424

Table 4.

Conditional logistic regression showing odds ratios (OR) and 95% confidence interval (CI) of cancer in situ (CIS) and invasive squamous cell carcinoma (SCC) among women with transient, acquired, or persistent HPV16 infection compared to those negative for HPV16 in both the first and second smear.

Conditional analysis^‡	CIS (N_cases = 241 N_ctrls = 241)		SCC (N_cases = 155 N_ctrls = 155)

	OR	95 % CI	OR	95 % CI

HPV16 status in the first and second smear
Negative -/-	1.00	Reference*	1.00	Reference*
Transience +/-	1.2	0.5-3.1	2.6	0.8-8.2
Acquisition -/+	7.6	2.8-20.5	2.9	1.2-7.3
Persistence +/+	18.5	6.5-52.9	19.5	4.7 – 81.7

^‡

Estimates were controlled for matching criteria (county, date of entry into cohort, and age at first normal smear).