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Table 4 Attribution of the factors to the infant death age

From: Infant, neonatal, and postneonatal mortality trends in a disaster region and in Japan, 2002–2012: a multi-attribute compositional study

Infant mortality age (0–364 days)
Variables Utility 95%CI Coef. SE p
Gender
 Male 62.2 60.8, 63.6 −2.38 1.05 0.023
 Female 64.6 63.1, 66.1    
Birth weight
 0–2499 g 58.5 57.1, 60.0 −12.4 1.38 < 0.001
 2500 g ≤ 70.9 68.9, 72.9    
Mother’s age
 15–34 years 62.5 62.4, 64.8    
 35 years ≤ 63.6 60.5, 64.5 −1.16 1.19 0.33
Gestational week
 22–36 weeks 43.4 41.7, 45.0 −40.28 1.34 < 0.001
 37–42 weeks 83.7 81.9, 85.3    
Parity
 Primiparous 55.9 54.4, 57.5 −13.1 1.06 < 0.001
 Multiparous 69.1 67.7, 70.5    
Mega earthquake
 Intensity 6 < 62.3 61.0, 63.6 −2.78 1.08 0.001
 Intensity ≤6 65.1 63.4, 66.8    
Region
 Tohoku 63.8 58.9, 68.7 0.51 2.57 0.842
 Other regions 63.3 62.2, 64.3    
  1. Note. p < 0.000, R-squared = 0.81, Adj. R-squared = 0.82
  2. Utility indicates average importance value on infant death age
  3. SE = standard error; Coef. = coefficient. Statistically significant at p < 0.05
  4. Source. Calculated by the authors from the data of the national infant death forms from the Ministry of Health, Labour, and Welfare