Table 4.

Linear regression coefficients, CIs and p-values for association between age at SCC diagnosis and the combination of age at first intercourse and number of sex partners before age 20^*

Characteristic			Univariate Model†		Multivariate Model‡
AFI	Number of sex partners before age 20	n	Coefficient (CI)	p-value	Coefficient (CI)	p-value
AFI=19	0–1 partners	60	Referent		Referent
AFI=19	2 or more partners	6	4.2 (−0.8, 9.1)	0.10	2.2 (−2.1, 6.4)	0.32
AFI 15–18	1 partner	68	−1.9 (−3.9, 0.2)	0.08	−2.3 (−4.1, −0.6)	0.01
AFI 15–18	2 or more partners	144	−3.7 (−5.5, −2.0)	<0.01	−2.5 (−4.0, −0.9)	<0.01
AFI<15	1 partner	2	3.2 (−5.2, 11.5)	0.46	3.2 (−4.1, −10.4)	0.39
AFI<15	2 or more partners	46	−5.8 (−8.1, −3.5)	<0.01	−4.2 (−6.3, −2.1)	<0.01

SCC= squamous cell cervical cancer, AFI= Age at first intercourse, CI=95% confidence interval

^†Univariate model includes only cases with information on all characteristics included in the multivariate model

^‡Adjusted for each other birth year, age at first menses (<14 years old/≥14), annual income at diagnosis (<$30,000/≥$30,000)