Table 6 Boundary sensitivity analysis.

Gamma	Nearest neighbor matching		Radius matching		Kernel matching
Gamma	sig+	sig−	sig+	sig−	sig+	sig−
1	<0.001	<0.001	<0.001	<0.001	0	0
1.1	<0.001	<0.001	<0.001	0	<0.001	0
1.2	<0.001	0	<0.001	0	<0.001	0
1.3	<0.001	0	<0.001	0	<0.001	0
1.4	0.007	0	<0.001	0	<0.001	0
1.5	0.060	0	0.004	0	<0.001	0
1.6	0.234	0	0.034	0	0.001	0
1.7	0.521	0	0.146	0	0.012	0
1.8	0.785	0	0.369	0	0.063	0
1.9	0.931	0	0.636	0	0.197	0
2	0.984	0	0.840	0	0.416	0

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