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Table 2 Odds ratios from logistic regression models predicting survey response in univariate (Unadjusted) and multivariate models (Adjusted)a

From: Evidence of non-response bias in the Press-Ganey patient satisfaction survey

Variable Comparison Unadjusted odds ratiob Adjusted odds ratioa Adjusted P value
Sex Female (Reference) -- -- --
Male 0.757 (0.697–0.823)c 0.782 (0.718–0.852) <.001
Age 18–29 (Reference) -- -- --
30–49 1.693 (1.457–1.967)c 1.708 (1.468–1.988) <.001
50–64 2.697 (2.334–3.117)c 2.715 (2.344–3.146) <.001
>= 65 2.247 (1.930–2.617)c 3.396 (2.815–4.096) <.001
Insurance Private (Reference)    
  Medicaid/Self pay/other 0.291 (0.238–0.354)c 0.311 (0.255–0.379) <.001
Medicare 0.775 (0.700–0.857)c 0.478 (0.413–0.553) <.001
Workers comp 0.578 (0.466–0.718)c 0.588 (0.472–0.733) <.001
Subspecialty Adult reconstruction (Reference) --   --
Foot and ankle 0.970 (0.814–1.155) 1.048 (0.876–1.253) 0.6086
Sports 0.836 (0.706–0.989)c 0.981 (0.824–1.168) 0.8282
Hand 0.707 (0.593–0.844)c 0.795 (0.663–0.953) 0.013
Spine 0.686 (0.554–0.851)c 0.755 (0.607–0.940) 0.012
Non-operative 0.682 (0.585–0.796)c 0.757 (0.645–0.888) <.001
Trauma 0.504 (0.400–0.635)c 0.623 (0.492–0.789) <.001
Distance > = 50 miles (Reference)    
<50 miles vs 1.106 (0.988–1.239) 1.103 (0.980–1.241) 0.104
  1. aDue to missing data on at least one of the predictor variables, 251 subjects were excluded, leaving 2737 in the responder group and 13791 in the non-responder group
  2. bThese values are given as the odds ratio (OR), with the 95 % confidence-interval (CI) in parentheses, predicting survey response in univariate (unadjusted) and multivariate (adjusted) models, adjusting for gender, age, insurance type, sub-specialty and distance from the clinic
  3. cSignificant at the 0.05 level in the unadjusted analysis