TABLE 2

Logistic Regression Model for Choice of a Chiropractor (n = 1 414)

VariableMaximum Likelihood CoefficientOdds Ratio Estimate (95% Wald Confidence Interval)
Intercept*0.7193
Baseline Oswestry**−0.02650.97 (0.97, 0.98)
Age square**0.0003331.00 (1.00, 1.00)
HOS score behavior subscale on 9-point scale**0.12181.13 (1.06, 1.21)
Trusts MDs (agree = 1)**−2.35180.095 (0.04, 0.21)
Trusts DCs (agree = 1)**3.306827.30 (16.23, 45.93)
Against taking prescription drugs (agree = 1)*0.45061.57 (1.11, 2.22)
Believes that MDs and DCs are equally skilled in treating LBP (agree = 1)**−0.94690.39 (0.28, 0.54)
Confidence in provider’s ability to successfully treat LBP (has confidence = 1)**1.80456.08 (3.84, 9.63)
Payer (reference category: self-pay)
    Oregon Health Plan**−3.68070.025 (0.011, 0.06)
    Insurance**−2.3240.098 (0.06, 0.16)
    Workers’ compensation**−2.0620.13 (0.066, 0.25)
    Auto insurance**−1.43390.24 (0.095, 0.60)
    Other**−1.91390.15 (0.07, 0.31)
Other marital status*−1.0070.37 (0.15, 0.87)
Income > $36 000*0.41631.52 (1.08, 2.13)

Note. Oswestry = Revised Oswestry Disability Questionnaire; HOS = Krantz Health Opinion Survey; MDs = medical doctors; DCs = chiropractors; LBP = low back pain.

*P < .05; **P < .01.