Table 1.
Comparison of baseline characteristics between the total EPIC-Norfolk cohort and those completing the 18-month follow-up health questionnaire (current sub-cohort).
| Baseline Characteristics | 2nd health questionnaire (Sub-cohort) | Non-respondents to the 2nd health questionnaire | Total Cohort |
| Total Number | 18465 | 11980 | 30445 |
| Age (Years), Mean ± SD | 59.0 ± 9.2 | 60.0 ± 9.7 | 59.4 ± 9.4 |
| Male (%) | 8029 (43.5) | 5672 (47.3) | 13701 (45.0) |
| Female (%) | 10436 (56.5) | 6308 (52.7) | 16744 (55.0) |
| Smoking Status N (%) | |||
| Current | 1873 (10.2) | 1858 (15.7) | 3731 (12.4) |
| Former | 7548 (41.2) | 5158 (43.6) | 12706 (42.1) |
| Never | 8897 (48.6) | 4824 (40.7) | 13721 (45.5) |
| Education Level | |||
| Below O level | 7067 (38.3) | 5585 (46.8) | 12652 (41.6) |
| O level | 2441 (13.2) | 1339 (11.2) | 3780 (12.4) |
| A level | 6468 (35.0) | 3806 (31.9) | 10274 (33.8) |
| Degree | 2489 (13.5) | 1216 (10.2) | 3705 (12.2) |