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Table 1 Characteristics, smoking behaviors and distribution of genotypes by smoking status

From: Association between Common Genetic Variants in the Opioid Pathway and Smoking Behaviors in Chinese Men

Characteristics Current smokers (n = 138) Ex-smokers (n = 146) P valuec
Age (years) a 56.4 ± 14.8 68.5 ± 8.3 <0.05
Education b    
< 9 years 49 (35.5) 51 (34.9) 0.92
≥ 9 years 89 (64.5) 95 (65.1)  
Disease history b    
Cardiovascular and cerebrovascular diseases 81 (58.7) 91 (62.3) 0.15
Respiratory diseases 38 (27.5) 45 (30.8)  
Diabetes mellitus 19 (13.8) 10 (6.8)  
Smoking behaviors a    
Age of smoking initiation (years) 23.6 ± 8.0 28.3 ± 10.8 <0.05
Daily cigarette consumption (per day) 22.3 ± 11.9 19.9 ± 9.9 0.06
Smoking years (years) 32.9 ± 14.3 31.7 ± 12.3 0.46
Genotype b    
rs1799971 d    
AA 64 (46.7) 72 (49.3) 0.54
AG 62 (45.3) 58 (39.7)  
GG 11 (8.0) 16 (11.0)  
rs1045280    
CC 2 (1.4) 2 (1.4) 0.99
CT 39 (28.3) 41 (28.1)  
TT 97 (70.3) 103 (70.5)  
rs2036657    
AA 98 (71.0) 103 (70.5) 0.93
AG 38 (27.5) 40 (27.4)  
GG 2 (1.4) 3 (2.1)  
rs3786047 d    
AA 1 (0.7) 2 (1.4) 0.87
AG 38 (27.5) 41 (28.1)  
GG 98 (71.0) 103 (70.5)  
rs3852209    
CC 79 (57.2) 99 (67.8) 0.11
CT 53 (38.4) 39 (26.7)  
TT 6 (4.3) 8 (5.5)  
rs2278060    
AA 77 (55.8) 94 (64.4) 0.28
AC 54 (39.1) 44 (30.1)  
CC 7 (5.1) 8 (5.5)  
  1. aValues are means ± SD.
  2. bValues are n (%). cP value from chi-square and t tests.
  3. dGenetic material for genotyping was available for 283 of the subjects.