TABLE 2

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

Variable	Maximum Likelihood Coefficient	Odds Ratio Estimate (95% Wald Confidence Interval)
Intercept*	0.7193
Baseline Oswestry**	−0.0265	0.97 (0.97, 0.98)
Age square**	0.000333	1.00 (1.00, 1.00)
HOS score behavior subscale on 9-point scale**	0.1218	1.13 (1.06, 1.21)
Trusts MDs (agree = 1)**	−2.3518	0.095 (0.04, 0.21)
Trusts DCs (agree = 1)**	3.3068	27.30 (16.23, 45.93)
Against taking prescription drugs (agree = 1)*	0.4506	1.57 (1.11, 2.22)
Believes that MDs and DCs are equally skilled in treating LBP (agree = 1)**	−0.9469	0.39 (0.28, 0.54)
Confidence in provider’s ability to successfully treat LBP (has confidence = 1)**	1.8045	6.08 (3.84, 9.63)
Payer (reference category: self-pay)
Oregon Health Plan**	−3.6807	0.025 (0.011, 0.06)
Insurance**	−2.324	0.098 (0.06, 0.16)
Workers’ compensation**	−2.062	0.13 (0.066, 0.25)
Auto insurance**	−1.4339	0.24 (0.095, 0.60)
Other**	−1.9139	0.15 (0.07, 0.31)
Other marital status*	−1.007	0.37 (0.15, 0.87)
Income > $36 000*	0.4163	1.52 (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.