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Characteristics of enrolled participants.
| Group A (43 total) | Group B (39 total) | Group C (52 total) | P value (A vs. B) | P value (A vs. C) | |
|---|---|---|---|---|---|
| Age | 47.2 ± 8.8 | 49.1 ± 8.0 | 46.9 ± 8.2 | 0.31 | 0.86 |
| Gender (male) | 40 | 35 | 43 | 0.60 | 0.13 |
| Years of road work | 14 ± 5.9 | 13 ± 5.1 | — | 0.42 | — |
