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. Author manuscript; available in PMC: 2019 Feb 1.
Published in final edited form as: J Adolesc Health. 2017 Dec 2;62(2):164–169. doi: 10.1016/j.jadohealth.2017.09.008

Table 2.

Predictor variables associated with the cumulative probabilities of sexual initiation over 2, 6, 18 and 30 months after HPV vaccination: Results of univariable ordered logistic regression models

Variable Odds Ratio (95% confidence interval)a P-value Adjusted Odds Ratio (95% confidence interval)b P-value
Perceived risk of STIs other than HPV, baseline (lower 2 tertiles vs. highest tertile) 1.91 (0.66–5.47) 0.23 0.40 (0.14–1.20) 0.10
Perceived need for safer sexual behaviors, baseline (lower 2 tertiles vs. highest tertile) 0.71 (0.26–1.95) 0.50 1.72 (0.61–4.87) 0.31
Age, baseline (years) 1.57 (1.07–2.29) 0.02

STI: sexually transmitted infection; HPV: human papillomavirus

a

Covariates included age; race; insurance status; HPV and HPV vaccine knowledge; lifetime alcohol, marijuana, and tobacco use; maternal knowledge about HPV and the HPV vaccine; maternal report of a doctor serving as a source of HPV vaccine information; and maternal report of communication with the daughter about the HPV vaccine. No other predictors were significantly associated with sexual initiation on univariable analyses at p<0.10.

b

Adjusted for age at baseline.