| High risk characteristics | Intervention (%) | Control (%) | χ2 | P | |
| Blood pressure | Yes | 62 (19.68) | 76 (26.95) | 4.422 | 0.035 |
| No | 253 (80.32) | 206 (73.05) | |||
| Smoking or not | Yes | 21 (18.26) | 40 (25.64) | 9.845 | 0.002 |
| No | 94 (81.74) | 116 (74.36) | |||
| Fasting blood glucose | Yes | 25 (10.20) | 48 (13.64) | 1.586 | 0.208 |
| No | 220 (89.80) | 304 (86.36) | |||
| Serum total cholesterol | Yes | 18 (23.08) | 25 (28.41) | 0.613 | 0.434 |
| No | 60 (76.92) | 63 (71.59) | |||
| Waist circumference | Yes | 83 (27.21) | 148 (28.91) | 0.270 | 0.603 |
| No | 222 (72.79) | 364 (71.09) | |||