Table 1.

Number of patients before and after matching for each drug comparison and HbA1c outcome.

	JNUH				KNUH				PNUH
	Unmatched		Matched∗		Unmatched		Matched∗		Unmatched		Matched∗
Oral hypoglycemic agents	T	C	T	C	T	C	T	C	T	C	T	C
Metformin (T) vs SU (C)	1542	1147	1147	1147	1026	556	556	556	1622	243	243	243
Metformin (T) vs DPP4I (C)	1542	745	721	721	1147	745	702	702	1026	489	484	484
SU (T) vs DPP4I (C)	1147	745	702	702	556	489	461	461	243	293	226	226
Metformin + DPP4I (T) vs Metformin + SU (C)	402	247	241	241	331	169	169	169	597	328	328	328
Metformin + DPP4I (T) vs SU + DPP4I (C)	402	60	60	60	331	35	35	35	597	49	49	49
Metformin + SU (T) vs SU + DPP4I (C)	247	60	56	56	169	35	35	35	328	49	49	49

C = comparator, DPP4I = dipeptidyl peptidase-4 inhibitors, HbA1c = glycosylated hemoglobin, JNUH = Jeonbuk National University Hospital, KNUH = Kangwon National University Hospital, PNUH = Pusan National University Hospital, SU = sulfonylurea, T = target.

^∗Propensity score matching covariates: sex, age.