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Table 7 Sensitivity analysis: including a dummy only for self-employed interacted with income classes and demand groups

From: The redistributive effects of copayment in outpatient prescriptions: evidence from Lombardy

Variables Copayment (Model #1) Cost (Model #2)
Number of prescriptions 3.805*** 9.052***
Female 3.592*** –6.630***
Age 0.222*** 0.792***
Number of children –0.286*** –1.746***
Family members with disability 2.674*** 5.387*
Dependent spouse –0.444*** –5.422***
Self Employed 2.489 –0.487
Income classes
 8,000 2.641* -1.856
 8,001−15,000 7.573*** 7.664
 15,001−24,000 9.287*** 14.36*
 24,001−35,000 11.18*** 18.55**
 35,001−55,000 14.76*** 26.01***
 55,001−75,000 12.74*** 16.41*
 >75,001 5.228*** 1.454
Demand groups
 Group #1 –35.69*** –32.45***
 Group #2 –34.74*** –59.10**
Interaction income classes-demand groups
 8,000 # Group #1 –1.688 –5.578
 8,000 # Group #2 –3.386 –0.212
 8,001−15,000 # Group #1 –7.694*** –15.86
 8,001−15,000 # Group #2 –8.731** –14.29
 15,001−24,000 # Group #1 –7.252*** –15.36
 15,001−24,000 # Group #2 –10.53*** –22.78
 24,001−35,000 # Group #1 –9.409*** –18.91*
 24,001−35,000 # Group #2 –12.16*** –28.55
 35,001−55,000 # Group #1 –11.39*** –23.16**
 35,001−55,000 # Group #2 –14.90*** –35.84
 55,001−75,000 # Group #1 –10.52*** –17.76*
 55,001−75,000 # Group #2 –12.02*** –24.82
 >75,001 # Group #1 –7.876*** –13.06
 >75,001 # Group #2 –5.68 –10.94
Interaction income classes-self employed
 8,000 # Self Employed –3.786* –3.611
 8,001−15,000 # Self Employed –5.629*** –4.236
 15,001−24,000 # Self Employed –8.117*** –5.236
 24,001−35,000 # Self Employed –9.487*** –11.69
 35,001−55,000 # Self Employed –11.13*** –13.32
 55,001−75,000 # Self Employed –8.184*** –6.413
 >75,001 # Self Employed –6.888*** –4.844
Interaction demand groups-self employed   
 Group #1 # Self Employed –0.796 0.195
 Group #2 # Self Employed –2.629 –3.847
Interaction income classes-demand groups-self employed
 8,000 # Group #1 # Self Employed 2.39 12.91
 8,000 # Group #2 # Self Employed 3.949 7.438
 8,001−15,000 # Group #1 # Self Employed 4.813** 11.95
 8,001−15,000 # Group #2 # Self Employed 6.03 7.423
 15,001−24,000 # Group #1 # Self Employed 5.258** 5.518
 15,001−24,000 # Group #2 # Self Employed 7.415 6.923
 24,001−35,000 # Group #1 # Self Employed 6.387*** 9.65
 24,001−35,000 # Group #2 # Self Employed 8.242* 12.58
 35,001−55,000 # Group #1 # Self Employed 7.309*** 9.288
 35,001−55,000 # Group #2 # Self Employed 9.505* 14.1
 55,001−75,000 # Group #1 # Self Employed 4.911** 8.113
 55,001−75,000 # Group #2 # Self Employed 5.503 4.98
 >75,001 # Group #1 # Self Employed 5.616*** 11.57
 >75,001 # Group #2 # Self Employed 5.087 4.929
ASL dummies included included
Marital status dummies included included
Constant 38.15*** 47.79***
Observations 2,301,571 2,301,571
R-squared 0.607 0.166
BIC 24,620,686.1 32,831,464.5
  1. Legend: * 10% significance level; ** 5%; *** 1%