Table 3 Adjusted odds ratios for age at tonsillectomy by oropharyngeal subsite compared with controlsa

From: Previous tonsillectomy modifies odds of tonsil and base of tongue cancer

  Base of tongue Tonsil
  OR (95% CI) P -value OR (95% CI) P -value
Age at tonsillectomy
No tonsillectomy Ref Ref
<13 years 2.46 (1.55–3.92) <0.001 0.19 (0.1–0.34) <0.001
13 years 0.33 (0.08–1.42) 0.138 0.32 (0.14–0.72) 0.006
Number of sexual partners
0–1 Ref Ref
2–5 2.22 (0.89–5.54) 0.087 3.46 (1.5–7.95) 0.004
6–14 3.5 (1.45–8.45) 0.005 5.71 (2.5–13.05) <0.001
14+ 3.96 (1.61–9.73) 0.003 7.8 (3.36–18.15) <0.001
Education
Some High School Ref Ref
Completed High School 0.66 (0.34–1.31) 0.234 0.59 (0.36–0.96) 0.034
Some College and above 0.5 (0.26–0.94) 0.031 0.4 (0.25–0.64) <0.001
Pack-years
<10 Pack-years Ref Ref
10 Pack-years 1.88 (1.16–3.04) 0.011 1.66 (0.98–2.83) 0.061
Insurance
Private Ref Ref
Medicaid/Medicare 0.59 (0.31–1.15) 0.120 0.78 (0.47–1.32) 0.360
None 0.81 (0.35–1.87) 0.624 0.92 (0.5–1.7) 0.797
Other 0.59 (0.3–1.18) 0.138 0.81 (0.47–1.41) 0.457
Alcohol
1 drink per week Ref Ref
>1 drink per week 1.30 (0.7–2.39) 0.402 2.24 (1.51–3.32) <0.001
  1. Abbreviations: CI=confidence interval; OR=odds ratio; Ref=reference value.
  2. aOdds ratios are all mutually adjusted for in addition to matching factors (age, race, and gender).