Table 1
Exposure to occupational and behavioural risk factors among employed Danish men and women in 1990 and relative risk (RR) and 95% confidence intervals (CI) for hospital treatment due to varicose veins* during 12 year follow up (1991–2002); results from Poisson regression
| Variable and level | n (%) | Cases | RR | 95% CI |
|---|---|---|---|---|
| Data regarding outpatients were included from 1995. | ||||
| *ICD-8 = 454 or ICD-10 = I83. | ||||
| Men | 2939 (100) | |||
| Prolonged standing or walking | ||||
| No | 1797 (61) | 21 | 1.00 | – |
| Yes | 1126 (38) | 19 | 1.75 | 0.92 to 3.34 |
| Heavy lifting (⩾¼ of working hours) | ||||
| No | 2349 (80) | 33 | 1.00 | – |
| Yes | 574 (20) | 7 | 0.81 | 0.35 to 1.90 |
| Baseline BMI | ||||
| <20 kg/m2 | 97 (3) | 1 | 0.96 | 0.13 to 7.15 |
| 20–24 kg/m2 | 1707 (58) | 24 | 1.00 | – |
| 25–29 kg/m2 | 953 (32) | 13 | 0.82 | 0.41 to 1.61 |
| ⩾30 kg/m2 | 166 (6) | 2 | 0.68 | 0.16 to 2.90 |
| Smoking status | ||||
| Never smoker | 944 (32) | 13 | 1.00 | – |
| Ex-smoker | 557 (19) | 9 | 0.89 | 0.38 to 2.09 |
| Smoker (<15 g/day) | 500 (17) | 7 | 0.85 | 0.34 to 2.13 |
| Smoker (⩾15 g/day) | 922 (31) | 11 | 0.69 | 0.31 to 1.55 |
| Women | 2708 (100) | |||
| Prolonged standing or walking | ||||
| No | 1729 (64) | 35 | 1.00 | – |
| Yes | 956 (35) | 36 | 1.82 | 1.12 to 2.95 |
| Heavy lifting (⩾¼ of working hours) | ||||
| No | 2384 (88) | 61 | 1.00 | – |
| Yes | 301 (11) | 10 | 1.16 | 0.59 to 2.31 |
| Baseline BMI | ||||
| <20 kg/m2 | 607 (22) | 12 | 0.82 | 0.43 to 1.56 |
| 20–24 kg/m2 | 1630 (6) | 44 | 1.00 | – |
| 25–29 kg/m2 | 361 (13) | 11 | 0.98 | 0.51 to 1.91 |
| ⩾30 kg/m2 | 87 (3) | 4 | 1.32 | 0.47 to 3.71 |
| Smoking status | ||||
| Never smoker | 1042 (38) | 29 | 1.00 | – |
| Ex-smoker | 438 (16) | 17 | 1.41 | 0.77 to 2.58 |
| Smoker (<15 g/day) | 652 (24) | 16 | 0.91 | 0.49 to 1.70 |
| Smoker (⩾15 g/day) | 553 (20) | 9 | 0.57 | 0.27 to 1.20 |
| No. of children | ||||
| 0 | 721 (27) | 12 | 1.00 | – |
| 1 | 497 (18) | 10 | 0.90 | 0.39 to 2.10 |
| ⩾2 | 1467 (54) | 49 | 1.21 | 0.64 to 2.30 |
