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Table 3 Decompositions of concentration index for unintended pregnancy in Iran

From: Socioeconomic inequality of unintended pregnancy in the Iranian population: a decomposition approach

  coefficient Elasticity normalized Ck Absolute contribution Percent Contribution
SES
The poorest 0.018 −0.019 −1.000 − 0.019 17.59
Poorer 0.017 0.016 −0.481 −0.008 7.34
Middle −0.029 −0.029 0.002 0.000 0.05
Richer −0.004 −0.004 0.500 −0.002 1.87
The richest*
Sum 26.86
Mother’s education level
Illiterate 0.001 0.000 −0.797 0.000 0.15
Under diploma −0.001 −0.001 − 0.518 0.001 − 0.57
Diploma 0.008 0.016 −0.054 −0.001 0.81
Academic *
Sum 0.39
Father’s education level
Illiterate 0.006 0.001 −0.739 −0.001 0.64
Under diploma 0.009 0.014 −0.551 −0.007 6.89
Diploma 0.011 0.020 0.017 0.000 −0.31
Academic*
Sum 7.22
BMI category
Underweight −0.062 −0.031 − 0.143 0.004 −4.06
Normal −0.045 −0.099 0.115 −0.011 10.50
Overweight −0.092 −0.150 − 0.005 0.001 − 0.69
Obese −0.049 − 0.025 −0.020 0.001 −0.47
Morbidly obese*
Sum 5.28
Mother’s age
<=19 0.017 0.003 −0.350 −0.001 0.97
20–29 −0.051 −0.120 − 0.153 0.018 −17.04
30–39 −0.061 − 0.142 0.201 − 0.029 26.43
> = 40*
Sum 10.37
Father’s age
<=19 0.04 0.000 −0.607 0.000 0.11
20–29 −0.035 −0.042 − 0.224 0.010 −8.80
30–39 −0.074 − 0.223 0.121 − 0.027 25.04
> = 40*
Sum 16.35
Mother’s nationality
Iranian −0.016 −0.075 0.276 −0.021 19.18
Others*
History of abortion
Yes 0.016 0.016 0.035 0.001 −0.52
No*
History of miscarriage
Yes −0.056 −0.002 0.177 0.000 0.32
No*  
Number of pregnancy
0 0.042 0.062 0.120 0.007 −6.93
1–3 0.011 0.016 −0.038 −0.001 0.56
> = 4*
Sum −6.37
Total observed −0.085 79.07
Residual −0.023 20.93
Total −0.108 100
  1. *denotes reference group