Parameter | Model 1* | Model 2† | Model 3‡ | |||
OR estimates | 95% Wald confidence limits | OR estimates | 95% Wald confidence limits | OR estimates | 95% Wald confidence limits | |
Mechanism of injury | ||||||
wr-mTBI (non-assault) | 1.00 | – | 1.00 | – | 1.00 | – |
Assault-induced wr-mTBI | 1.72 | 1.26 to 2.36 | 2.12 | 1.52 to 2.96 | 2.14 | 1.53 to 2.99 |
Injury severity (hospitalisation) | ||||||
Not hospitalised | 1.00 | – | 1.00 | – | 1.00 | – |
Hospitalised | 7.73 | 6.20 to 9.63 | 6.94 | 5.54 to 8.70 | 6.98 | 5.57 to 8.75 |
Sex | ||||||
Male | 0.83 | 0.68 to 1.03 | 1.06 | 0.84 to 1.34 | 1.05 | 0.83 to 1.33 |
Age at the time of injury (by decade) | ||||||
15–24 years | 1.00 | – | 1.00 | – | 1.00 | – |
25–34 years | 0.57 | 0.40 to 0.83 | 0.54 | 0.37 to 0.78 | 0.54 | 0.37 to 0.78 |
35–44 years | 0.53 | 0.36 to 0.76 | 0.48 | 0.33 to 0.70 | 0.48 | 0.33 to 0.70 |
45–54 years | 0.39 | 0.27 to 0.56 | 0.36 | 0.25 to 0.51 | 0.36 | 0.25 to 0.51 |
55+ years | 0.36 | 0.25 to 0.53 | 0.34 | 0.23 to 0.50 | 0.34 | 0.23 to 0.51 |
Employment type | ||||||
Full-time employee | 1.00 | – | 1.00 | – | 1.00 | – |
Part-time employee | – | – | 1.09 | 0.79 to 1.51 | 1.08 | 0.78 to 1.50 |
Other employees | – | – | 0.96 | 0.74 to 1.26 | 0.96 | 0.73 to 1.25 |
Employer size | ||||||
Large | 1.00 | – | 1.00 | – | 1.00 | – |
Medium | – | – | 0.72 | 0.56 to 0.93 | 0.72 | 0.56 to 0.92 |
Small | – | – | 0.43 | 0.32 to 0.56 | 0.42 | 0.32 to 0.56 |
Occupation type | ||||||
Community and personal service occupations | 1.00 | – | 1.00 | – | 1.00 | – |
Service-oriented occupations | – | – | 0.66 | 0.47 to 0.95 | 0.66 | 0.46 to 0.95 |
Professionals | – | – | 0.83 | 0.56 to 1.23 | 0.84 | 0.57 to 1.24 |
Goods-oriented occupations | – | – | 0.68 | 0.48 to 0.98 | 0.67 | 0.46 to 0.96 |
Socioeconomic status | ||||||
9–10 (advantaged) | 1.00 | – | 1.00 | – | 1.00 | – |
7–8 (advantaged) | – | – | – | – | 1.06 | 0.79 to 1.43 |
5–6 (middle) | – | – | – | – | 1.00 | 0.75 to 1.34 |
3–4 (disadvantaged) | – | – | – | – | 1.28 | 0.91 to 1.80 |
1–2 (most disadvantaged) | – | – | – | – | 1.21 | 0.86 to 1.70 |
Categories mechanism of injury, injury severity, age at the time of injury and employer size (small) were significant at p<0.000; categories employer size (medium) and occupation type were significant at p=0.01 and p=0.02 respectively.
↵*Model adjusted for personal demographic factors (sex and age as per above).
↵†Model re-adjusted to include workplace factors (employment type, employer size and occupation type as per above).
‡Model re-adjusted to include social factors (socioeconomic status as per above).
wr-mTBI, work-related mild traumatic brain injury.