Proportions reporting unknown smoking status among cases and controls
| Characteristic | Cases n = 4295 | Controls n = 1952 |
|---|---|---|
| Age group (years) | (%) | (%) |
| 25–34 | 45.7 | 47.7 |
| 35–44 | 49.5 | 44.0 |
| 45–54 | 43.1 | 42.9 |
| 55–64 | 40.7 | 38.6 |
| 65–74 | 36.6 | 40.2 |
| 75+ | 35.5 | 38.2 |
| Education | ||
| None | 19.4 | 18.5 |
| Primary | 19.4 | 19.0 |
| Secondary/tertiary | 16.6 | 13.1 |
| Unknown | 66.2 | 70.1 |
| Relationship of informant to deceased | ||
| Parent | 42.8 | 54.4 |
| Spouse | 38.4 | 40.6 |
| Son/daughter | 36.7 | 41.2 |
| Other relative | 44.9 | 42.5 |