Table 3 Decompositions of concentration index for unintended pregnancy in Iran
From: Socioeconomic inequality of unintended pregnancy in the Iranian population: a decomposition approach
| Â | 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 | |||