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Table 1 Demographic characteristics of study population current smokers at time of biospecimen collection stratified by race/ethnicity

From: Association of internal smoking dose with blood DNA methylation in three racial/ethnic populations

  Japanese Americans Native Hawaiians Whites
N 203 205 204
Age (years), mean (SD) 61 (6.95) 57 (12.82) 62 (6.85)
Gender, N (%)    
 Males 101 (49.7) 101 (49.3) 101 (49.5)
 Females 102 (50.3) 104 (50.7) 103 (50.5)
BMI (kg/m2), mean (SD) 25.53 (4.71) 29.29 (7.05) 26.61 (5.78)
Pack-years, mean (SD) 44.68 (17.95) 42.44 (24.15) 56.82 (24.53)
CPD, mean (SD) 19.93 (7.45) 21.15 (9.5) 26.32 (11.38)
CYP2A6 activity, mean (SD) 0.85 (1.47) 1.08 (1.14) 1.43 (1.73)
NE (nmol/ml) 34.98 (27.78) 50.26 (41.49) 55.20 (48.86)
Cell types, mean (SD)
 CD8 cells** 0.03 (0.04) 0.05 (0.04) 0.02 (0.03)
 CD4T cells 0.16 (0.07) 0.16 (0.06) 0.16 (0.08)
 Natural killer cells* 0.06 (0.04) 0.06 (0.04) 0.04 (0.03)
 B cells** 0.08 (0.04) 0.08 (0.03) 0.06 (0.03)
 Monocytes 0.05 (0.04) 0.05 (0.03) 0.06 (0.04)
 Granulocytes* 0.67 (0.12) 0.66 (0.11) 0.69 (0.12)
  1. *P value for trend < 0.005, indicating significant ethnic differences
  2. **P value for trend < 0.0005, indicating significant ethnic differences