| Character | Non-MetS 776 (65.7%) | MetS 405 (34.3%) | p value |
| Insomnia syndrome (n, %) | 321 (41.4) | 186 (46.0) | 0.13 |
| A. Insomnia symptoms |
|
| 0.49 |
| a. 1 symptom only | 228 (29.4) | 131 (32.3) |
|
| Combined 2 symptoms | 73 (9.4) | 39 (9.6) |
|
| Combined 3 symptoms | 13 (1.7) | 11 (2.7) |
|
| Combined 4 symptoms | 7 (0.9) | 5 (1.4) |
|
| b. Difficulty falling sleep | 189 (24.3) | 127 (31.3) | 0.01* |
| c. Difficulty staying sleep | 138 (17.8) | 66 (16.2) | 0.49 |
| d. Non-refreshing sleep | 34 (4.4) | 15 (3.8) | 0.61 |
| e. Frequent awaking from sleep or dreamy | 71 (9.1) | 47 (11.6) | 0.17 |
| B. Insomnia duration |
|
| 0.64 |
| Less than 1 month | 51 (6.6) | 24 (6.1) |
|
| 1 month - 1/2 year | 31 (4.0) | 19 (4.8) |
|
| 1/2 year - 1 year | 44 (5.7) | 26 (6.4) |
|
| 1 year - 3 years | 70 (9.0) | 40 (9.9) |
|
| More than 3 years | 125 (16.1) | 76 (18.8) |
|