Table 1 Hand-arm vibration exposure in relation to retrospective Raynaud's phenomenon. Retrospective dose-response analysis Cox regression. Hand-arm vibration exposure dose was defined as the product of exposure hours and the hand-arm vibration exposure value, unit hours · m/s2 (h · m/s2).
Variable | Event | Censored | Ratio | 95% Hazard Ratio Confidence Limits |
|---|---|---|---|---|
Non-exposed = 0–1600 h · m/s2 | 3 | 45 | 1 | NA |
Q1 1601–7578 h · m/s2 | 19 | 18 | 2.83 | 0.71–11.3 |
Q2 7579–16787 h · m/s2 | 19 | 20 | 10.2 | 2.96 – 35.0 |
Q3 16788–39699 h · m/s2 | 16 | 21 | 11.4 | 3.38 – 38.7 |
Q4 >39700 h · m/s2 | 6 | 31 | 12.1 | 3.57 – 40.9 |