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Table 14 Current cigar smoking and laryngeal cancer by inhalation level, cigars per day, and duration

From: Systematic review of cigar smoking and all cause and smoking related mortality

Study Cohort name Inhalation level Cigars per day Duration (years) Effect estimate 95% CI Measure Primary/secondary*
Shanks1998 CPS-I   1 to 2   6.45 (0.72, 23.27) IRR Primary
Shanks1998 CPS-I   5+   26.03 (8.39, 60.74) IRR Primary
Shapiro2000 CPS-II   1 to 2   6 (0.70, 53.50) HR Primary
Shapiro2000 CPS-II   3+   15 (3.40, 65.90) HR Primary
Shanks1998 CPS-I None    10.6 (3.87, 23.07) IRR Primary
Shanks1998 CPS-I Moderate-deep   53.26 (0.70, 296.32) IRR Primary
Shapiro2000 CPS-II No inhalation   4.2 (0.50, 37.10) HR Primary
Shapiro2000 CPS-II Inhalation    39 (8.40, 180.10) HR Primary
Shapiro2000 CPS-II    <25 0 (0.00, 0.00) HR Primary
Shapiro2000 CPS-II    25+ 13.7 (3.40, 54.50) HR Primary
  1. *Primary cigar smoking: current, exclusive cigar smoking with no previous history of cigarette or pipe smoking; secondary cigar smoking: current, exclusive cigar smoking with previous history of cigarette or pipe smoking.