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Table 1 Demographic information for the discovery and replication cohorts stratified by sex

From: X chromosome-wide analysis identifies DNA methylation sites influenced by cigarette smoking

Variable N (%) or mean (SD)
Twins I (n = 139) Twins II (n = 78) GSE50660 male (n = 327) GSE50660 female (n = 137) GSE42861 male (n = 95) GSE42861 female (n = 238)
Current smoker      
 Yes 47 (34 %) 17 (22 %) 15 (4.6 %) 7 (5.1 %) 23 (24 %) 66 (28 %)
 No 92 (66 %) 61 (78 %) 312 (95 %) 130 (95 %) 72 (76 %) 172 (72 %)
Age 55.7 (3.3) 55.4 (3.3) 54.6 (6.8) 57.3 (5.9) 55.5 (10.5) 51.7 (11.7)
BMI 28.9 (4.3) 29.7 (4.1) NA NA NA NA
  1. NA not available