Table 2.

Estimated marginal utilities.

Variable	Est	SE
Main effects
Change in Oxford Hip Score	0.130	0.008***
28-day emergency readmission rate (%)	−0.053	0.004***
1-year revision rate (%)	−0.017	0.010
28-day mortality rate (%)	−0.038	0.028
Distance (in km)	−0.270	0.007***
Distance2	0.002	0.000***
Distance3	−0.00001	0.000***
NHS trust – medium	−0.572	0.031***
NHS trust – multi-service	−0.663	0.096***
NHS trust – small	−0.832	0.039***
NHS trust – specialist	1.016	0.075***
NHS trust – teaching	−0.444	0.034***
Independent sector treatment centre	−1.564	0.039***
Primary care trust	−1.256	0.206***
Waiting time (proportion waiting >120 days)	−0.157	0.077*
Interaction with distance
× Patient age	−0.002	0.000***
× Male	0.015	0.012
× Past utilisation	−0.018	0.005***
× Comorbidity count	0.0002	0.001
× Income deprivation	−0.261	0.046***
Interaction with waiting time
× Patient age	0.008	0.003**
× Male	−0.076	0.055
× Past utilisation	0.022	0.063
× Comorbidity count	−0.046	0.033
× Income deprivation	1.126	0.469*
Interaction with change in Oxford Hip Score
× Patient age	0.001	0.000*
× Male	−0.007	0.006
× Past utilisation	−0.007	0.007
× Comorbidity count	−0.008	0.003*
× Income deprivation	−0.420	0.050***
Interaction with 28-day emergency readmission rate
× Patient age	−0.0004	0.000*
× Male	−0.001	0.004
× Past utilisation	0.012	0.004**
× Comorbidity count	0.001	0.002
× Income deprivation	0.122	0.027***
Interaction with 1-year revision rate
× Patient age	0.001	0.000
× Male	0.012	0.009
× Past utilisation	−0.002	0.011
× Comorbidity count	0.000	0.005
× Income deprivation	−0.045	0.068
Interaction with 28-day mortality rate
× Patient age	−0.001	0.001
× Male	−0.058	0.023*
× Past utilisation	0.046	0.028
× Comorbidity count	−0.008	0.016
× Income deprivation	−0.111	0.179
WTT (OHS change)	0.899	0.056***
WTT (Readmission rate)	−0.625	0.050***
WTT (Revision rate)	−0.067	0.041
WTT (Mortality rate)	−0.068	0.049
Number of patients	170,916
Number of providers	228
BIC	442,722
Pseudo R2	0.659

Notes: Conditional logit model of choice of hospital for elective hip replacement patients treated between April 2010 and March 2013. Waiting time and quality metrics are lagged by one year. Coefficients are marginal utilities. Interactions of patient characteristics with distance², distance³ and provider type are not reported (available on request). WTT (OHS) is the ratio of the coefficient on the quality variable to the marginal utility of distance $\left({\beta }_d+2{\beta }_{d^2}+3{\beta }_{d^3}^2\right)$ evaluated at the average distance to the chosen provider.

^***p < 0.001;

^**p < 0.01;

^*p < 0.05.