| Variable | N | Total |  |  |
---|---|---|---|---|---|
 | Mean ± SD |  | p-value | ||
Evaluation grade of facilities, n (%) | A (Reference) | 17 | 161.18 ± 6.67 | < 0.001 | |
B | 122 | 133.66 ± 10.04*** |  | ||
C | 82 | 123.96 ± 5.23*** |  | ||
D | 8 | 112.12 ± 0.35*** |  |  | |
 | No evaluation | 173 | 141.06 ± 12.09*** |  | |
Age group | 40’s (Reference) | 27 | 127.56 ± 11.59 | 0.003 | |
 | 50’s | 207 | 135.70 ± 14.26** |  | |
 | 60’s | 168 | 136.79 ± 12.27*** |  | |
Work period group (year) | < 3 (Reference) | 54 | 133.13 ± 13.30 | 0.258 | |
 | 3 to < 5 | 152 | 136.10 ± 13.17 |  | |
 | ≥ 5 | 196 | 135.90 ± 13.70 |  | |
Marital status | Single (Reference) | 8 | 130.00 ± 0.00 | 0.137 | |
 | Married | 344 | 136.15 ± 13.52 |  | |
 | Divorced / widowed / others | 50 | 132.74 ± 13.59 |  | |
Educational level | < High school (Reference) | 104 | 131.35 ± 9.70 | 0.001 | |
 | High school | 266 | 136.77 ± 13.06*** |  | |
 | > High school | 32 | 139.72 ± 21.89 |  | |
Economic status | Poor (Reference) | 176 | 129.66 ± 10.31 | < 0.001 | |
 | Normal | 163 | 135.37 ± 13.14*** |  | |
 | Enough | 63 | 152.81 ± 4.15*** |  |