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. 2008 Jun 16;3:13. doi: 10.1186/1745-6673-3-13

Table 2.

Hand-arm vibration exposure in relation to prospective white fingers.

Variable Event Censored Ratio 95% Hazard Ratio Confidence Limits
Non-exposed = 0–1600 h · m/s2 10 75 1 NA
Quartile 1 = 1601–3520 h · m/s2 3 22 1.02 0.28 – 3.71
Quartile 2= 3521–7070 h · m/s2 5 20 1.77 0.61 – 5.19
Quartile 3= 7071–18086 h · m/s2 4 21 1.37 0.43 – 4.382
Quartile 4 = >18086 h · m/s2 6 19 2.15 0.78 – 5.91

Prospective 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).