Table 4

Adjusted multinomial logistic regression models for the associations between persistent pain status at 18 months and wage replacement duration group, overall cohort (n=1131)

Wage replacement duration 3–12 months vsWage replacement duration 12–18 months vs
1 day to 3 months1 day to 3 months
Model 1Model 2Model 1Model 2
OR95% CIP valueOR95% CIP valueOR95% CIP valueOR95% CIP value
Model intercept0.700.441.120.140.760.471.210.250.240.140.41<0.010.250.150.44<0.01
Pain groupMild pain, functional impairment unlikely1.290.901.850.171.300.901.870.162.931.904.52<0.013.091.994.81<0.01
Ref: no pain groupSevere pain, functional impairment likely2.001.333.02<0.012.041.343.10<0.018.465.3513.38<0.019.355.8514.94<0.01
Claimant age<30 years old0.630.371.090.100.630.361.090.100.790.451.410.430.790.441.420.43
Ref: 30–39 years old40–49 years old0.950.581.550.850.950.581.550.831.100.661.840.721.130.671.910.65
50–59 years old1.200.771.880.411.230.781.930.371.330.832.140.231.350.832.190.23
Over 60 years old1.200.712.010.491.140.671.940.621.771.043.010.031.751.023.010.04
SexFemale0.840.621.140.260.830.611.130.230.820.601.120.200.850.621.170.32
Ref: male and other not specified
Nature of injuryFracture2.721.614.61<0.012.741.614.65<0.012.961.725.10<0.012.981.725.16<0.01
Ref: sprain/strain/dislocationSuperficial or open wound0.500.300.840.010.500.300.830.010.700.431.130.150.710.441.160.17
Organ/blood vessel/muscle injury, internal injury, crushing, amputation1.330.832.150.241.360.842.200.211.560.962.530.071.570.972.560.07
Other3.641.707.79<0.013.711.737.95<0.010.520.151.740.290.530.161.780.30
Unknown1.470.872.470.151.460.852.500.172.291.373.80<0.012.301.363.90<0.01
Prior chronic conditionBack problems prior to the work injury--------0.860.571.300.47--------0.650.421.000.05
Ref: no prior conditionArthritis prior to the work injury--------0.950.621.470.82--------1.040.681.610.84
Mood disorder prior to the work injury--------0.640.401.030.07--------0.450.270.76<0.01
  • Model 1 independent variables: pain group, claimant age, sex and nature of injury. Model 2 independent variables: Model 1+ presence of back problems prior to the work injury, presence of arthritis prior to the work injury and presence of a mood disorder prior to the work injury. Bold values indicate OR statistically significant at the α=0.05 level.