Effects of Genetic Variants in the Nicotine Metabolism Pathway on Smoking Cessation

Table 1

The characteristics of the subjects.

Variables	Successful quitters (n = 363)	Failed quitters (n = 345)
Age (years)	61.931 ± 10.806	57.499 ± 12.090
Age group (young/middle/old)	22 (6.06)/188 (51.79)/153 (42.15)	51 (14.78)/194 (56.23)/100 (28.99)
Occupation (farmer/others)	289 (76.61)/74 (20.39)	276 (80.00)/69 (20.00)	0.898
Education (low/middle/high)	111 (30.58)/204 (56.20)/48 (13.22)	85 (24.64)/211 (61.16)/49 (14.20)	0.210
Marital status (married/unmarried/others)	319 (87.88)/7 (1.93)/37 (10.19)	322 (83.33)/3 (0.87)/20 (5.80)	0.044
Age of smoking onset (year)	21.375 ± 5.569	22.296 ± 7.049	0.054
CPD	21.333 ± 15.864	19.316 ± 11.545	0.055
Pack-year	31.458 ± 27.658	32.215 ± 23.636	0.696
Smoking duration (years)	29.026 ± 13.088	33.693 ± 13.377

Values are expressed as mean ± SD or frequency (%). Age group: young = age <45, middle = 45≤ age <65, old = age ≥65. Education: low = below the primary school, middle = primary and middle school, high = high school or more. Pack-year = CPD/20 × number of years smoked. CPD: cigarettes per day.