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Table 4 Results from the difference-in-differences regression analysis comparing project and control group 18 month before and 18 months after the intervention

From: Improving accessibility for outpatients in specialist clinics: reducing long waiting times and waiting lists with a simple analytic approach

Waiting time (Std. Err.) P-value Number of Patients Waiting
  Coefficient Coefficient (Std. Err.) P-value
Post Treatment
 Period
  1 28,18 (10,02) 0,005 12,96 (56,30) 0,818
  2 25,09 (10,02) 0,012 1,01 (56,27) 0,986
  3 14,11 (10,02) 0,159 −56,41 (56,30) 0,317
  4 8,82 (10,03) 0,379 −93,71 (56,32) 0,096
  5 1,32 (10,04) 0,896 − 132,46 (56,38) 0,019
  6 −15,06 (10,60) 0,155 −165,82 (59,52) 0,005
  7 −24,83 (10,73) 0,021 − 211,22 (60,28) 0,000
  8 −29,53 (10,75) 0,006 − 269,94 (60,39) 0,000
  9 −40,92 (10,90) 0,000 − 301,34 (61,25) 0,000
  10 −42,21 (10,92) 0,000 − 331,88 (61,36) 0,000
  11 −44,73 (10,94) 0,000 −322,51 (61,44) 0,000
  12 −48,74 (11,78) 0,000 − 333,20 (66,15) 0,000
  13 −50,62 (12,66) 0,000 − 271,42 (71,14) 0,000
  14 −54,43 (12,70) 0,000 − 219,07 (71,36) 0,002
  15 −58,85 (12,93) 0,000 − 297,31 (72,61) 0,000
  16 −62,90 (13,13) 0,000 −333,16 (73,73) 0,000
  17 −65,66 (13,17) 0,000 − 354,65 (73,96) 0,000
  18 −69,85 (13,55) 0,000 − 374,09 (76,11) 0,000
Constant 145,50 (20,13) 0,000 1390,87 (113,05) 0,000
Fixed effects for month   Yes    Yes  
Fixed effects for clinics   Yes    Yes  
R2   0.57    0.92  
Number of Clinics (Treatment/control)   38(12/26)    38(12/26)