Occurrence of occupational injury (logistic regression model) and number of injuries (zero-inflated negative binomial regression model) according to job stress scales
| Job stress scale* | OR† (95% CI) | IRR‡ (95% CI) |
|---|---|---|
| Total firefighters | ||
| Job demands (high) | 1.42 (1.25 to 1.60) | 1.08 (0.95 to 1.22) |
| Job control (low) | 0.93 (0.84 to 1.04) | 0.97 (0.90 to 1.10) |
| Interpersonal conflicts (high) | 1.26 (1.13 to 1.39) | 1.06 (0.96 to 1.17) |
| Job insecurity (high) | 0.83 (0.74 to 0.93) | 0.91 (0.81 to 1.01) |
| Organisational system (poor) | 1.39 (1.24 to 1.54) | 1.02 (0.92 to 1.13) |
| Rewards (low) | 1.05 (0.90 to 1.22) | 1.09 (0.98 to 1.20) |
| Workplace environment (negative) | 1.35 (1.22 to 1.50) | 1.06 (0.96 to 1.18) |
| Fire suppression | ||
| Job demands (high) | 1.49 (1.25 to 1.77) | 1.22 (1.01 to 1.47) |
| Job control (low) | 0.92 (0.79 to 1.06) | 0.89 (0.76 to 1.03) |
| Interpersonal conflicts (high) | 1.18 (1.02 to 1.37) | 0.97 (0.83 to 1.12) |
| Job insecurity (high) | 0.73 (0.61 to 0.87) | 0.93 (0.78 to 1.12) |
| Organisational system (poor) | 1.33 (1.14 to 1.55) | 1.00 (0.85 to 1.17) |
| Rewards (low) | 1.13 (0.97 to 1.31) | 1.10 (0.94 to 1.27) |
| Workplace environment (negative) | 1.41 (1.21 to 1.64) | 0.99 (0.85 to 1.16) |
| Emergency medical services | ||
| Job demands (high) | 1.26 (1.03 to 1.54) | 1.05 (0.88 to 1.25) |
| Job control (low) | 1.02 (0.85 to 1.21) | 1.20 (1.04 to 1.38) |
| Interpersonal conflicts (high) | 1.40 (1.19 to 1.66) | 1.18 (1.03 to 1.36) |
| Job insecurity (high) | 0.88 (0.74 to 1.04) | 0.90 (0.78 to 1.04) |
| Organisational system (poor) | 1.55 (1.30 to 1.85) | 1.12 (0.96 to 1.29) |
| Rewards (low) | 1.43 (1.21 to 1.69) | 1.17 (1.02 to 1.35) |
| Workplace environment (negative) | 1.30 (1.10 to 1.54) | 1.16 (1.01 to 1.34) |
| Officers | ||
| Job demands (high) | 1.96 (1.35 to 2.85) | 0.70 (0.48 to 1.04) |
| Job control (low) | 1.06 (0.77 to 1.47) | 0.91 (0.67 to 1.24) |
| Interpersonal conflicts (high) | 1.22 (0.90 to 1.65) | 0.85 (0.60 to 1.19) |
| Job insecurity (high) | 0.78 (0.56 to 1.09) | 0.93 (0.67 to 1.30) |
| Organisational system (poor) | 1.28 (0.94 to 1.75) | 0.81 (0.61 to 1.09) |
| Rewards (low) | 1.12 (0.82 to 1.52) | 0.78 (0.58 to 1.06) |
| Workplace environment (negative) | 1.54 (1.13 to 2.10) | 0.86 (0.64 to 1.16) |
*All job stress scales were compared to their counterparts.
†OR and 95% CI were calculated using a logistic regression model adjusted for sex, age group, marriage status, smoking status, hazardous drinking and occupational exposures.
‡IRR and 95% CI were calculated using a zero-inflated negative binomial regression model adjusted for sex, age group, marriage status, smoking status, hazardous drinking and occupational exposures.
IRR, incidence rate ratio.