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Table 1 Summary statistics on the characteristics of the study population (those with UEBMI vs. those without any insurance)

From: The effects of compulsory health insurance on birth outcomes: evidence from China’s UEBMI scheme

  All
(N = 160,429)
Without any insurance
(N = 59,276)
With UEBMI
(N = 101,153)
Variable Mean S.D. Mean S.D. Mean S.D.
A: Individual characteristics
Age 30.770 3.933 30.780 4.323 30.760 3.686
Age square 962.000 249.200 965.900 271.900 959.800 234.900
Migrant status 0.391 0.488 0.487 0.500 0.334 0.472
Gravidity 1.822 1.102 1.972 1.215 1.734 1.020
Parity 1.256 0.460 1.315 0.506 1.222 0.427
Employed 0.943 0.233 0.886 0.317 0.976 0.154
Ethnic status 0.986 0.117 0.985 0.120 0.987 0.115
Nationality 0.998 0.047 0.994 0.076 1.000 0.007
Marriage status 0.998 0.045 0.996 0.061 0.999 0.031
C-section 0.416 0.493 0.451 0.498 0.395 0.489
B: Birth outcomes
Birth weight (in grams) 3294.000 486.500 3274.000 517.600 3305.000 466.900
Low birth weight (< 2500 g) 0.050 0.218 0.059 0.235 0.045 0.206
Very low birth weight (< 1500 g) 0.00564 0.0749 0.00679 0.0821 0.00448 0.0668
Low Apgar score (< 7 scores) 0.008 0.090 0.010 0.098 0.007 0.085
Prematurity (< 37 weeks) 0.0624 0.242 0.0739 0.262 0.0557 0.229
Abnormal health condition at birth (AHCAB) 0.216 0.412 0.249 0.432 0.197 0.398
C: Maternal health behavior indicators
High-risk pregnancy 0.568 0.495 0.602 0.489 0.548 0.498
Pregnancy complications 0.145 0.352 0.163 0.369 0.135 0.341
Any condition (gestational diabetes, hypertension, anemia) 0.106 0.308 0.131 0.337 0.0914 0.288