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 |