Coffee use     
    Null   Weekly   Daily Trend Interaction
Genotype na ORb na OR (95% CI)b na OR (95%CI)b P P
Current smokers                
CYP1A2*1C                
GG 12/23 1.00 (referent) 11/63 0.28 (0.10-0.80) 31/322 0.16 (0.06-0.39) <0.0001 0.03
GA + AA 3/30 1.00 (referent) 9/41 2.27 (0.49-10.5) 30/235 1.37 (0.35-5.38) 0.92  
CYP1A2*1F                
AA 5/23 1.00 (referent) 8/38 0.64 (0.15-2.75) 30/241 0.39 (0.11-1.37) 0.10 0.52
CA+CC 10/31 1.00 (referent) 13/66 0.63 (0.23-1.72) 31/316 0.33 (0.14-0.81) 0.008  
Nonsmokers                
CYP1A2*1C                
GG 13/65 1.00 (referent) 10/108 0.44 (0.17-1.14) 24/281 0.43 (0.19-0.96) 0.07 0.59
GA+AA 9/63 1.00 (referent) 9/87 1.04 (0.33-3.27) 17/191 0.73 (0.26-2.04) 0.48  
CYP1A2*1F                
AA 7/63 1.00 (referent) 10/80 1.56 (0.43-5.72) 11/209 0.38 (0.11-1.30) 0.06 0.53
CA+CC 15/67 1.00 (referent) 9/115 0.34 (0.13-0.87) 30/263 0.51 (0.24-1.10) 0.20  
OR, odds ratio; CI, confidence interval.
aNumber of cases/controls.
bAdjusted for age, hospital, rank in the Self-Defense Forces, leisure-time physical activity, body mass index, current use of alcoholic beverages (sake, shochu, beer, whisky and wine), past alcohol use and green tea intake.
Table 4: Relationship between coffee consumption and type 2 diabetes with stratification by CYP1A2 genotype among current smokers and nonsmokers.
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