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. 2015 Oct 16;10(10):e0140700. doi: 10.1371/journal.pone.0140700

Table 4. Relationship of betel nut, tobacco, smoking, and alcohol and status of hr-HPV in Oral cavity patients only.

Characteristic Oral cavity Cases (n = 86) N (%) hr-HPV positive (n = 24)N (%) HPV—Negative (n = 62) N (%) Unadjusted OR [95% CI] P –value
Univariate analysis
Betel quid
Non-chewers 9 (10.46) 6 (25) 3 (4.84) 1.0 (referent)
Chewers 77 (89.54) 18 (75) 59 (95.16) 0.15[0.03–0.79] 0.01
Tobacco- chewers
Non-chewers 30 (34.88) 10 (41.67) 20 (32.25) 1.0 (referent)
Chewers 56 (65.12) 14 (58.33) 42 (67.75) 0.67[0.23–1.96] 0.41
Smoking habit
Non- smokers 66 (76.74) 20 (83.33) 46 (74.19) 1.0 (referent)
Smokers 20 (23.26) 4 (16.67) 16 (25.81) 0.57[0.14–2.17] 0.36
Alcohol intake
No-intake 64 (74.42) 14 (58.33) 50(80.64) 1.0 (referent)
Intake 22 (25.58) 10 (41.67) 12 (19.36) 2.98[0.95–9.43] 0.03*
Both Tobacco-Alcohol habits
Non-Intake 69 (80.23) 16 (66.67) 53 (85.48) 1.0 (referent)
Intake 17 (19.77) 8 (33.33) 9 (14.52) 2.94 [0.97–8.88] 0.05*
Both Smoking -Alcohol habits
Non- smokers 77 (89.54) 20 (83.33) 57 (91.93) 1.0 (referent)
Smokers 9 (10.46) 4 (16.66) 5 (8.06) 2.28 [0.55–9.33] 0.25

* Statistically Significant OR = odds ratio; CI = confidence interval;

Reference group for OR calculation