Table 5 Mean efficiency scores of each category of management by year (conditional model)

PFI

0.915

0.946

0.937

0.948

0.953

0.940

(0.065)

(0.050)

(0.051)

(0.049)

(0.041)

(0.046)

PPP

0.971

0.972

0.939

0.978

0.945

0.961

(0.036)

(0.034)

(0.054)

(0.038)

(0.039)

(0.033)

Public management

0.913

0.913

0.946

0.951

0.959

0.936

(0.087)

(0.090)

(0.051)

(0.044)

(0.041)

(0.039)

Others

0.844

0.915

0.974

0.923

0.943

0.920

(0.071)

(0.091)

(0.034)

(0.082)

(0.070)

(0.059)

TOTAL

0.909

0.929

0.947

0.949

0.953

0.937

(0.078)

(0.075)

(0.048)

(0.051)

(0.044)

(0.043)

Kruskal-Wallis test

0.043

0.048

0.046

0.045

0.042

0.040