Table 4

Relative difference in mean costs by demographic and injury characteristics: multivariable analyses* of all 470 participants (excluding car occupants)

Relative difference95% CIp Value
Monthly income† 1.011.00 to 1.020.02
Insurance
 No1.00
 Yes0.890.78 to 1.020.11
MAIS
 11.00
 21.160.94 to 1.440.16
 31.291.04 to 1.610.02
 41.371.06 to 1.800.02
 51.991.43 to 2.77< 0.001
Principal injured region
 Face1.00
 Spine/thorax/abdomen0.960.77 to 1.190.70
 Upper extremity1.190.96 to 1.460.10
 Hip/lower extremity1.281.07 to 1.54< 0.01
 Head1.251.06 to 1.49< 0.01
LOS (days)1.131.11 to 1.16< 0.001
Interaction of LOS and MAIS0.990.98 to 1.000.01

  • ↵* Model including monthly income, insurance status, injury severity MAIS, principal injury regions, LOS and a first order interaction between injury severity and LOS.

  • ↵† The unit of monthly income was in US$10.

  • LOS, length of hospital stay; MAIS, maximum abbreviated injury scale.