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Table 2 General characteristics of subjects

From: Socioeconomic status can affect pregnancy outcomes and complications, even with a universal healthcare system

Variables No. (%) of women
NHI MA Total P value
Total 457,336 (99.1) 4244 (0.9) 461,580 (100)  
Age*
 Mean ± SD 31.6 ± 4.29 32.7 ± 6.57 31.6 ± 4.31 <0.001
 20-34 350,977(76.7) 2399(56.5) 353,376(76.6) <0.001
  ≥ 35 106,359(23.3) 1845(43.5) 108,204(23.4)  
Area*     <0.001
 Metropolitan 192,006 (42.0) 1687 (39.8) 193,693 (42.0)  
 City 228,394(49.9) 2020(47.6) 230,414 (49.9)  
 Rural 36,936 (8.1) 537 (12.7) 37,473 (8.1)  
Level of Income*, a     <0.001
 High (upper 25%) 115,589 (25.3) 0 (0.0) 115,589 (25.0)  
 Medium (25-75%) 229,966 (50.3) 0 (0.0) 229,966 (49.8)  
 Low (lower 25%) 111,781 (24.4) 4244(100) 116,025 (25.1)  
Charlson comorbidity index     0.112
 0 451,963(98.8) 4183(98.6) 456,146(98.8)  
  ≥ 1 5373(1.2) 61(1.4) 5434(1.2)  
  1. No number, NHI National Health Insurance, MA Medical Aid, SD Standard Deviation
  2. aLevel of income was categorized as high level (upper 25% of premium), intermediate level (middle 50% of premium), and low level (lower 25% of premium) based on their national health insurance premium
  3. *P < 0.05 calculated by chi-square test or t-test