Table 1. Background characteristics of the 33,411 cases and controls in Hong Konga.
| Case | Control | All | ||||
| n | % | n | % | N | % | |
| Males | 11,273 | 52.8 | 3,232 | 26.8 | 14,505 | 43.4 |
| Age (Mean, SD) | 71.9 | ±14.2 | 67.9 | ±10.9 | 70.4 | ±13.2 |
| Place of birth | ||||||
| Hong Kong | 3,919 | 18.4 | 1,844 | 15.3 | 5,763 | 17.3 |
| Guangdong (China) | 14,853 | 69.7 | 8,800 | 73.2 | 23,653 | 71.0 |
| Other places | 2,539 | 11.9 | 1,384 | 11.5 | 3,923 | 11.8 |
| Housing type | ||||||
| Public estate | 9,700 | 48.9 | 5,860 | 48.9 | 15,560 | 46.7 |
| Self-owned | 8,037 | 41.3 | 4,955 | 41.3 | 12,992 | 39.0 |
| Hurt/shared | 2,199 | 5.5 | 659 | 5.5 | 2,858 | 8.6 |
| Quarter/others | 1,405 | 4.3 | 521 | 4.3 | 1,926 | 5.8 |
| Education | ||||||
| None | 8,624 | 40.9 | 5,057 | 42.4 | 13,681 | 41.4 |
| Primary | 7,828 | 37.1 | 4,725 | 39.7 | 12,553 | 38.0 |
| Secondary | 3,845 | 18.2 | 1,837 | 15.4 | 5,682 | 17.2 |
| Tertiary | 803 | 3.8 | 299 | 2.5 | 1,102 | 3.3 |
| Job type history | ||||||
| Sedentary | 2,660 | 12.6 | 1,156 | 9.7 | 3,816 | 11.6 |
| Light/medium | 10,937 | 51.8 | 5,609 | 46.9 | 16,536 | 50.1 |
| Heavy | 3,179 | 15.1 | 1,425 | 11.9 | 4,604 | 13.9 |
| None | 4,312 | 20.5 | 3,768 | 31.5 | 8,080 | 24.5 |
| Heavy drinker | 2,276 | 10.7 | 589 | 4.9 | 2,865 | 8.6 |
| Ever smoked | 8,184 | 38.4 | 2,454 | 20.4 | 10,638 | 31.9 |
| Exercise <4 times/month | 15,192 | 73.2 | 7,656 | 64.8 | 22,848 | 70.2 |
| Fruit <7 times/wk | 6,545 | 36.6 | 2,875 | 28.5 | 9,420 | 33.7 |
| Combined risk factors | ||||||
| 0 | 2,602 | 14.8 | 2,394 | 24.1 | 4,996 | 18.2 |
| 1 | 6,188 | 35.3 | 4,294 | 43.2 | 10,482 | 38.1 |
| 2 | 5,377 | 30.7 | 2,447 | 24.2 | 7,824 | 28.5 |
| 3 | 2,592 | 14.8 | 690 | 6.9 | 3,282 | 11.9 |
| 4 | 786 | 4.5 | 123 | 1.2 | 909 | 3.3 |
a
Excluded ex-smokers and ex-drinkers.