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 3 The impact of PMES policy intervention on the 3-month retention rate before (non-PMES period) and after the implementation of PMES (PMES period), divided into PMES only (2019/01~2019/12) and PMES with add-on MCAM later (2019/01~2019/08) in Taiwan

Model parameters	PMES only				PMES + add-on MCAM later
Model parameters	n	β	S.E.	P value	n	β	S.E.	P value
Overall	32				34
Intercept		47.83	1.26	< 0.01^*		49.82	1.07	< 0.01^*
Baseline slope		0.07	0.03	0.02^*		0.06	0.03	0.02^*
Level change after intervention		8.03	3.46	0.02^*		11.78	3.64	< 0.01^*
Slope change after intervention		− 1.04	0.44	0.02^*		− 1.87	0.69	< 0.01^*
Tiny	19				13
Intercept		44.84	2.07	< 0.01^*		47.36	1.79	< 0.01^*
Baseline slope		0.05	0.05	0.36		0.03	0.04	0.42
Level change after intervention		8.27	5.67	0.15		17.84	6.06	< 0.01^*
Slope change after intervention		− 1.08	0.72	0.14		− 3.65	1.15	< 0.01^*
Small	10				14
Intercept		47.23	1.60	< 0.01^*		44.81	1.47	< 0.01^*
Baseline slope		0.07	0.04	0.06		0.09	0.04	0.01^*
Level change after intervention		9.28	4.38	0.04^*		14.12	5.00	< 0.01^*
Slope change after intervention		− 0.86	0.56	0.13		− 1.23	0.95	0.20
Medium	3				7
Intercept		55.58	3.03	< 0.01^*		59.76	2.03	< 0.01^*
Baseline slope		0.05	0.07	0.49		0.04	0.05	0.44
Level change after intervention		5.51	8.31	0.51		5.66	6.89	0.41
Slope change after intervention		− 1.39	1.06	0.19		− 1.86	1.31	0.16
Large	9				–
Intercept		52.77	1.16	< 0.01^*		–	–	–
Baseline slope		0.04	0.03	0.15		–	–	–
Level change after intervention		7.78	3.19	0.02^*		–	–	–
Slope change after intervention		− 0.05	0.41	0.90		–	–	–

ISSN: 1748-5908