Assessing the impact of public funding in alleviating participant reduction and improving the retention rate in methadone maintenance treatment clinics in Taiwan: an interrupted time series analysis

Table 4 The impact of the add-on MCAM policy intervention on the monthly average number of daily participants before (PMES-only period) and after the implementation of MCAM (PMES with add-on MCAM period) from September 2019 to December 2019 in Taiwan

Model parameters	PMES + add-on MCAM
Model parameters	n	β	S.E.^a	P value
Overall	34
Intercept		73.86	0.54	< 0.01^*
Baseline slope		− 0.16	0.11	0.16
Level change after intervention		− 1.50	0.95	0.15
Slope change after intervention		0.28	0.33	0.41
Tiny	13
Intercept		35.19	0.53	< 0.01^*
Baseline slope		0.38	0.10	0.01^*
Level change after intervention		0.29	0.94	0.76
Slope change after intervention		− 0.62	0.32	0.09
Small	14
Intercept		81.50	0.99	< 0.01^*
Baseline slope		− 0.15	0.19	0.46
Level change after intervention		− 3.11	0.72	< 0.01^*
Slope change after intervention		0.14	0.30	0.65
Medium	7
Intercept		130.39	0.42	< 0.01^*
Baseline slope		− 1.20	0.07	< 0.01^*
Level change after intervention		− 1.60	0.60	0.03^*
Slope change after intervention		2.23	0.22	< 0.01^*

^aUsing Newey-West standard errors that are adjusted for autocorrelation for small- and medium-scale clinics
*P value < 0.05

ISSN: 1748-5908