Table 1 Characteristics of overall sample and by city
|  | Overall | Leipzig | Hong Kong | χ2/t | p |
|---|---|---|---|---|---|
Age, M (SD) | 71.03 (6.87) | 72.06 (6.78) | 69.96 (6.81) | 3.82*** | < .001 |
BMI, M (SD) | 23.59 (3.25) | 25.19 (2.91) | 22.02 (2.77) | 13.97*** | < .001 |
Gender, n (%) | Â | Â | Â | 8.60** | .003 |
 Male | 292 (47.3%) | 129 (41.5%) | 163 (53.3%) |  |  |
 Female | 325 (52.7%) | 182 (58.5%) | 143 (46.7%) |  |  |
Marital status, n (%) | Â | Â | Â | 2.10 | .15 |
 Single | 152 (24.8%) | 84 (27.3%) | 68 (22.2%) |  |  |
 Married | 462 (75.2%) | 224 (72.7%) | 238 (77.8%) |  |  |
Education level, n (%) | Â | Â | Â | 14.37*** | .001 |
 Primary school | 375 (61.7%) | 205 (67.9%) | 170 (54.8%) |  |  |
 High school | 144 (23.4%) | 52 (17.2%) | 92 (29.7%) |  |  |
 University | 93 (14.9%) | 45 (14.9%) | 48 (15.5%) |  |  |