Table 1.
Participant characteristics according to smoking status (n=8734)*
| Smoking history | Smoking cessation† | |||||
| Ever smoker (n=5525) |
Never smoker (n=3209) | P values for difference | Current smoker (n=1356) |
Former smoker (n=4169) |
P values for difference | |
| Health literacy, n (%) | 0.001 | <0.001 | ||||
| Adequate | 3647 (66.0) | 2233 (69.6) | 840 (61.9) | 2807 (67.3) | ||
| Limited | 1878 (34.0) | 976 (30.4) | 516 (38.1) | 1362 (32.7) | ||
| General cognitive ability, mean (SD) | −0.04 (1.00) | 0.08 (0.99) | <0.001 | −0.02 (0.99) | −0.05 (1.01) | 0.385 |
| Age (years), mean (SD) | 65.53 (10.13) | 64.93 (10.24) | 0.005 | 62.12 (9.12) | 66.64 (10.20) | <0.001 |
| Sex, n (%) | 0.001 | <0.001 | ||||
| Female | 2752 (49.8) | 2172 (67.7) | 761 (56.1) | 1991 (47.8) | ||
| Male | 2773 (50.2) | 1037 (32.3) | 595 (43.9) | 2178 (52.2) | ||
| Age left full-time education, n (%) | <0.001 | <0.001 | ||||
| 14 years or under | 1104 (20.6) | 553 (17.6) | 233 (17.7) | 871 (21.5) | ||
| 15–16 years | 2936 (54.8) | 1578 (50.2) | 856 (65.0) | 2080 (51.4) | ||
| 17–18 years | 665 (12.4) | 488 (15.5) | 128 (9.7) | 537 (13.3) | ||
| 19 years or over | 657 (12.3) | 526 (16.7) | 99 (7.5) | 558 (13.8) | ||
| Occupational social class, n (%) | <0.001 | <0.001 | ||||
| Managerial and professional | 1677 (30.8) | 1047 (33.2) | 274 (20.6) | 1403 (34.2) | ||
| Intermediate | 1263 (23.2) | 884 (28.1) | 312 (23.4) | 951 (23.2) | ||
| Routine and manual | 2499 (45.9) | 1218 (38.7) | 747 (56.0) | 1752 (42.7) | ||
*Characteristics for age left full-time education are based on a subset of 8507 participants with this data and characteristics for occupational social class are based on a subset of 8588 participants with this data.
†For smoking cessation comparisons, the ever smoker category is divided into whether ever smokers are current or former smokers.