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

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

Waiting time		(Std. Err.)	P-value	Number of Patients Waiting
	Coefficient	(Std. Err.)	P-value	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)

ISSN: 1472-6963