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Table 1 Baseline characteristics by treatment groups

From: Combined nicotine patch with gum versus nicotine patch alone in smoking cessation in Hong Kong primary care clinics: a randomised controlled trial

Characteristic Single NRT
(N = 286)
Combined NRT (N = 274) p-value
Age (in years), mean (SD) 50.56 (12.08) 50.41 (12.30) 0.884
Male, No. (%) 236 (82.5) 241 (88.0) 0.091
Marital Status, No. (%) 0.386
 Single 48 (16.8) 37 (13.5)  
 Married 208 (72.7) 216 (78.8)  
 Divorced/Separated 23 (8.0) 17 (6.2)  
 Widowed 7 (2.4) 4 (1.5)  
Education, No. (%) 0.565
 No formal schooling 3 (1.0) 7 (2.6)  
 Primary 60 (21.0) 61 (22.3)  
 Secondary 203 (71.0) 187 (68.2)  
 Tertiary 20 (7.0) 19 (6.9)  
Work status, No. (%) 0.310
 Unemployed 61 (21.3) 47 (17.2)  
 Full time 181 (63.3) 188 (68.6)  
 Part time 16 (5.6) 8 (2.9)  
 Retired 20 (7.0) 24 (8.8)  
 Housewife 8 (2.8) 7 (2.6)  
Payment status, No. (%) 0.506
 Entitled patients 234 (81.8) 220 (80.3)  
 Waivers 18 (6.3) 24 (8.8)  
 Hospital Authority staff/Civil servants 29 (10.1) 28 (10.2)  
 Others 5 (1.7) 2 (0.7)  
Cluster, No. (%) 0.946
 HKEC 56 (19.6) 56 (20.4)  
 KCC 55 (19.2) 57 (20.8)  
 KEC 61 (21.3) 51 (18.6)  
 NTEC 57 (19.9) 55 (20.1)  
 NTWC 57 (19.9) 55 (20.1)  
Co-existing diseases
 Respiratory disease, No. (%) 18 (6.3) 15 (5.5) 0.816
 CVS disease, No. (%) 105 (36.7) 80 (29.2) 0.072
 Endocrine disease, No. (%) 59 (20.6) 54 (19.7) 0.868
Smoking history
 No. of cigarettes/day used, mean (SD) 18.44 (6.90) 18.68 (6.88) 0.683
 Heavy Smoker (≥20 cigarettes/day), No. (%) 162 (56.6) 155 (56.6) 0.988
 Years smoked, mean (SD) 31.93 (11.94) 32.17 (12.43) 0.817
 Pack-years, mean (SD) 29.45 (15.37) 30.18 (16.65) 0.591
 Fagerstrom score, mean (SD) 5.57 (2.01) 5.85 (1.79) 0.090
Fagerstrom score, No. (%) 0.347
 Low dependence (0–2) 22 (7.7) 12 (4.4)  
 Low to Moderate (3, 4) 58 (20.3) 51 (18.6)  
 Moderate (5–7) 160 (55.9) 161 (58.8)  
 High dependence (8+) 46 (16.1) 50 (18.2)  
 Baseline CO level (ppm), mean (SD) 20.36 (12.03) 20.83 (12.49) 0.652
  1. Note: NRT Nicotine replacement therapy, SD Standard deviation
  2. For all continuous variables, mean and SD were reported and p-values were calculated from two sample t-test; for all categorical variables, number and proportion were reported and p-values were calculated from Chi-square test