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Table 1 Characteristics of study subjects

From: GWAS of habitual coffee consumption reveals a sex difference in the genetic effect of the 12q24 locus in the Japanese population

  Discovery (East Japan) Replication (West Japan) P
N 6,264 5,975
Female, % 45.8 47.7 0.04
Age, years (mean ± SD) 49.9 ± 13.0 50.6 ± 13.3 0.005
BMI, kg/m2 (mean ± SD) 23.1 ± 3.8 23.0 ± 3.6 0.03
Coffee consumption, cups/day (mean ± SD) 2.01 ± 1.43 2.04 ± 1.41 0.30
Current alcohol drinkers, % 63.9 59.3 <  0.001
Current alcohol consumption, g/day (mean ± SD)a 12.2 ± 14.2 10.9 ± 12.6 < 0.001
  1. aAmong current alcohol drinkers, BMI Body mass index, SD Standard deviation
  2. P-values were calculated using Fisher’s exact test for sex and current alcohol drinkers, and Student’s t-test for all other variables