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Table 4.

Variables associated with the annual number of workers’ compensation patients in the multivariate negative binomial regression model (n=1,733)

IRRWald’s 95% confidence interval of the IRRp–value

(Constant)0.60(0.30 to 1.19)0.143

General information

Type of clinic
Sole practitionerReference
Group of DCs1.23(1.04 to 1.54)0.018
Multidisciplinary without MD1.19(1.01 to 1.40)0.039
Multidisciplinary with MD1.35(0.96 to 1.89)0.082

Population of practice area
Under 10,0001.19(0.94 to 1.51)0.157
Between 10,000 and 49,9991.37(1.10 to 1.69)0.004
Between 50,000 and 99,9991.19(0.96 to 1.48)0.122
Between 100,000 and 499,9991.36(1.11 to 1.67)0.003
Over 500,000Reference

Practice province
QuebecReference
British-Columbia1.63(1.23 to 2.15)0.001
Alberta1.52(1.13 to 2.05)0.005
Saskatchewan4.34(2.89 to 6.52)<0.001
Manitoba2.67(1.81 to 3.90)<0.001
Ontario1.23(0.96 to 1.58)0.106
Atlantic provinces3.04(2.07 to 4.46)<0.001

Professional activity
Number of hours of practice per week1.02(1.01 to 1.03)<0.001

Number of treatments per week1.01(1.00 to 1.01)<0.001

Education, research and teaching

Post graduate studies0.78(0.63 to 0.96)0.017

Management training in the last 3 years0.76(0.65 to 0.89)<0.001

Main sectors of activity

Occupational/ Industrial1.59(1.09 to 2.32)0.017

Care provided to patients

DC performs his own radiographs0.85(0.70 to 1.03)0.098

Electrotherapy1.30(1.12 to 1.52)0.001

Soft-tissue therapy1.21(1.01 to 1.47)0.044

Chiropractic techniques used

Sacral Occipital technique0.78(0.62 to 0.98)0.030

Thompson1.21(1.04 to 1.42)0.017

Cranio-sacral technique0.79(0.60 to 1.02)0.073

Types of conditions treated

Percentage of patients with neuromusculoskeletal conditions1.01(1.00 to 1.01)0.009

Referral practice

Percentage of patients referred by their employer1.02(1.01 to 1.04)0.003

Percentage of patients referred by a physician1.02(1.01 to 1.03)<0.001
IRR = incidence rate ratio

Pearson’s chi-square = 2,264

Pearson’s chi-square/degree of freedom = 1.329