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. 2020 Apr 19;20:325. doi: 10.1186/s12913-020-05137-1

Table 2.

Reduction in variation

Model R-squared (%) Standard deviation of residuals
Std. dev. Reduction (%)
Unadjusted model 0 1.075 0
Model with control variables
 Demand-side variables 51.78 0.747 30.562
 Demand-side + supply-side variables 54.04 0.729 32.240

Notes: The complete regression results for the specification with all observable control variables are to be found in Table 3