Table 2 Socio-demographic characteristics of the study samples
|  | Development sample (N = 530) | Internal validation (N = 520) | External validation Sample (N = 1925) | |||
|---|---|---|---|---|---|---|
Mean | SD | Mean | SD | Wt. Mean | SE | |
Age (years) | 42.5 | 11.9 | 41.9 | 11.9 | 40.1 | 0.41 |
| Â | n | % | n | % | n | Wt.% (SE) |
Age group | ||||||
 21–39 years | 213 | 41.5 | 220 | 44.1 | 909 | 52.3 (1.4) |
 40 years and above | 300 | 58.5 | 279 | 55.9 | 1016 | 47.7 (1.4) |
Gender | ||||||
 Men | 266 | 50.3 | 216 | 41.6 | 921 | 52.1 (1.4) |
 Women | 263 | 49.7 | 303 | 58.4 | 1004 | 47.9 (1.4) |
Ethnicity | ||||||
 Chinese | 229 | 43.5 | 209 | 40.6 | 1149 | 71.1 (1.1) |
 Malay | 139 | 26.4 | 128 | 24.9 | 320 | 14.1 (0.9) |
 Indian | 158 | 30.0 | 178 | 34.6 | 366 | 11.0 (0.7) |
 Other | – | – | – | – | 90 | 3.9 (0.5) |
Marital status | ||||||
 Never married | 205 | 38.8 | 182 | 35.1 | 583 | 34.9 (1.4) |
 Married | 282 | 53.3 | 288 | 55.5 | 1168 | 59.1 (1.4) |
 Divorced/ Separated/ Widowed | 42 | 7.9 | 49 | 9.5 | 170 | 6.1 (0.6) |
Education level | ||||||
 Some/Primary | 31 | 5.9 | 50 | 9.8 | 70 | 3.0 (0.4) |
 Secondary to Junior College | 202 | 38.2 | 191 | 37.1 | 810 | 40.0 (1.4) |
 Vocational / Diploma | 163 | 30.8 | 155 | 30.0 | 424 | 24.0 (1.2) |
 University and above | 133 | 25.1 | 120 | 23.3 | 621 | 33.0 (1.3) |