Table 1 Baseline characteristics comparison within the groups (n = 225)
|  |  | P-group (n = 100)a | C-group (n = 125)a | χ2 | P |
|---|---|---|---|---|---|
Gender | Male | 25 (25.0%) | 38 (30.4%) | 0.804 | 0.370 |
Female | 75 (75.0%) | 87 (69.6%) | Â | Â | |
Marriage | In marriage | 90 (90.0%) | 111 (88.8%) | 0.804 | 0.772 |
Out marriage | 10 (10.0%) | 14 (11.2%) | Â | Â | |
Age structure | 50 ~ 60year | 30 (30.0%) | 55 (44.0%) | 4.796 | 0.091 |
61 ~ 70year | 55 (55.0%) | 53 (42.4%) |  |  | |
71 ~ 80year | 15 (15.0%) | 17 (13.6%) |  |  | |
Post-work type | Physical work | 81 (81.0%) | 96 (76.8%) | 0.854 | 0.445 |
Mental work | 19 (19.0%) | 29 (23.2%) | Â | Â | |
Education | 9 years or below | 87 (87.0%) | 105 (84.0%) | 0.400 | 0.527 |
Above 9 years | 13 (13.0%) | 20 (16.0%) | Â | Â |