Baseline characteristics and comorbid medical disorders for the control cohort and patients with varicose vein
| Characteristic, n (%) | Varicose vein, n=4644 | Matched controls, n=17 742 | Standardised difference |
| Age (years) | 0.02275 | ||
| <65 | 3164 (68.13) | 12 275 (69.19) | |
| ≧65 | 1480 (31.87) | 5467 (30.81) | |
| Age (mean±SD) | 55.70±16.03 | 56.10±16.04 | 0.02514 |
| Gender | 0.00944 | ||
| Male | 1796 (38.67) | 6780 (38.21) | |
| Female | 2848 (61.33) | 10 962 (61.79) | |
| Hypertension | 0.04519 | ||
| No | 3750 (80.75) | 14 637 (82.50) | |
| Yes | 894 (19.25) | 3105 (17.50) | |
| Diabetes | 0.05807 | ||
| No | 4247 (91.45) | 16 501 (93.01) | |
| Yes | 397 (8.55) | 1241 (6.99) | |
| Hyperlipidaemia | 0.08429 | ||
| No | 4413 (95.03) | 17 157 (96.70) | |
| Yes | 231 (4.97) | 585 (3.30) | |
| Coronary artery disease | 0.07832 | ||
| No | 4489 (96.66) | 17 375 (97.93) | |
| Yes | 155 (3.34) | 367 (2.07) |
P value was calculated based on the two sample t-test and Pearson’s X2 test.