Table 2.

The L1 measure of imbalance before and after the coarsened exact matching

Variables	before matching L1(mean)	after matching L1(mean)
Region	0.30265 (0.30265)	1.6e-15 (4e-15)
Gender	0.00177 (−0.00177)	1.2e-15 (0)
Age	0.05425 (0.0583)	2.9e-15 (−6.7e-15)
Marital status	0.08921 (−0.02041)	1.1e-15 (−8.4e-15)
Distance a	0.0538 (0.08406)	9.4e-16 (2.2e-16)
Household size	0.04367 (0.08231)	2.4e-15 (8.7e-15)
Education level	0.16496 (−0.22206)	1.5e-15 (−2e-15)
SHI	0.02789 (−0.02789)	8.6e-16 (−1.7e-16)
CHI	0.07514 (−0.07514)	1.1e-15 (5.3e-15)
Multivariate L1	0.50114	0.00797
N	6111	4015

Note: CHI Commercial health insurance, SHI Social health insurance; ^aDistance to the nearest healthcare facilities