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Table 3 The difference in covariate variables for the UEBMI insured residents and uninsured residents before and after the matching (%)

From: The effects of China’s urban basic medical insurance schemes on the equity of health service utilisation: evidence from Shaanxi Province

  Before matching After matching
  Insured Uninsured Standardized bias (%) p Insured Uninsured Standardized bias (%) p
Annual personal expenditure 8.94 8.64 54.8 0.000 8.76 8.74 4.3 0.490
Female 46.3 57.3 -22.1 0.000 47.3 50.5 -6.4 0.315
45-59 41.3 22.9 40.3 0.000 34.1 36.7 -5.6 0.394
60+ 26.0 16.7 22.7 0.000 16.8 15.0 4.4 0.440
Health status 4.34 4.38 -20.5 0.000 4.36 4.36 -2.2 0.729
Married 87.5 64.0 57.1 0.000 82.6 81.9 1.9 0.743
Other marital status 7.8 10.6 -9.9 0.003 8.5 8.3 0.7 0.910
Primary school 9.2 10.5 -4.6 0.169 10.1 11.4 -4.6 0.478
Junior middle school 26.5 31.4 -10.7 0.001 32.2 30.8 3.0 0.636
Senior middle school 39.2 34.4 9.9 0.004 38.9 39.1 -0.4 0.949
Diploma 13.9 7.4 21.2 0.000 10.1 10.3 -0.6 0.917
College degree or above 8.0 7.4 2.3 0.500 4.9 5.1 -0.7 0.886
Retired 41.8 7.8 85.5 0.000 20.7 19.5 3.0 0.639
Student 0.1 14.7 -58.3 0.000 0.2 0.2 0.0 1.000
Unemployed 7.9 57.1 -123.4 0.000 33.9 31.6 5.9 0.422
Guanzhong 87.6 82.8 13.4 0.000 85.2 86.2 -2.8 0.654
Shannan 6.0 8.4 -9.0 0.006 7.1 7.1 0.0 1.000
Commercial health insurance 5.8 4.3 7.1 0.041 5.1 4.3 3.6 0.555
Household population 1.10 1.19 -25.3 0.000 1.18 1.19 -2.4 0.713