Table 3

Multivariable regression models showing the odds of taking days away from work as a result of wr-mTBI-assault, with adjustments for injury severity, demographic, workplace and social factors (n=3129)

ParameterModel 1* Model 2 Model 3‡
OR estimates95% Wald confidence limitsOR estimates95% Wald confidence limitsOR estimates95% Wald confidence limits
Mechanism of injury
 wr-mTBI (non-assault)1.001.001.00
 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 hospitalised1.001.001.00
 Hospitalised 7.73 6.20 to 9.63 6.94 5.54 to 8.70 6.98 5.57 to 8.75
Sex
 Male0.830.68 to 1.031.060.84 to 1.341.050.83 to 1.33
Age at the time of injury (by decade)
 15–24 years1.001.001.00
 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 employee1.001.001.00
 Part-time employee1.090.79 to 1.511.080.78 to 1.50
 Other employees0.960.74 to 1.260.960.73 to 1.25
Employer size
 Large1.001.001.00
 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 occupations1.001.001.00
 Service-oriented occupations 0.66 0.47 to 0.95 0.66 0.46 to 0.95
 Professionals0.830.56 to 1.230.840.57 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)1.001.001.00
 7–8 (advantaged)1.060.79 to 1.43
 5–6 (middle)1.000.75 to 1.34
 3–4 (disadvantaged)1.280.91 to 1.80
 1–2 (most disadvantaged)1.210.86 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.