Socioeconomic status and self-rated health in Iran: findings from a general population study

Table 3 Decomposition of socioeconomic inequalities in poor SRH among Iranian adults

	Marginal effect	Elasticity	C_x	Contribution to the C_n
	Marginal effect	Elasticity	C_x	Contribution	%	Summed%
Demographic variables
Age Group (18–30 [ref.])
31–45 years	0.039	0.082	− 0.035	− 0.004	1.1
46–60 years	0.127	0.141	0.049	0.008	− 2.6
61 years and above	0.186	0.068	− 0.039	− 0.026	8.0	6.4
Gender (Male [ref.])
Female	0.064	0.178	− 0.009	− 0.002	0.6	0.6
Marital status (Single [ref.])
Married	− 0.017	− 0.06	− 0.014	0.001	− 0.3
Other (Divorce, separated and widows)	0.029	0.01	− 0.282	− 0.003	1	0.7
Socioeconomic variables
Education status (illiterate [ref.])
less than diploma	0.007	0.009	− 0.223	− 0.002	0.8
High school diploma and bachelor’s degree	0.017	0.052	0.091	0.006	− 1.8
Master’s degree and above	0.011	0.005	0.360	0.002	− 0.7	− 1.7
Wealth index of individuals (Poorest [ref.])
Poorer	− 0.100	− 0.106	− 0.399	0.052	− 16.1
Middle	− 0.123	− 0.130	0.001	0.000	0.0
Richer	− 0.111	− 0.119	0.401	− 0.059	18.1
Richest	− 0.121	− 0.128	0.801	− 0.127	39.1	41.2
Health insurance status (Yes [ref.])
No	− 0.0033	− 0.045	− 0.189	0.010	− 3.2	− 3.2
Life style variables
Chronic condition (No [ref.])
Yes	− 0.216	− 0.136	− 0.118	− 0.020	6.1	6.1
Smoking status (Never [ref.])
Former	0.087	0.027	− 0.128	− 0.004	1.3
Current	0.055	0.020	− 0.205	− 0.005	1.5	2.8
BMI (Normal [ref.])
Overweight	0.003	0.006	0.023	0.023	− 7.2
Obesity	0.122	0.058	− 0.116	− 0.116	35.8	28.6
Physical activity (Good [ref.])
Moderate	0.101	0.158	− 0.056	− 0.034	10.4
Weak	0.234	0.251	− 0.173	− 0.054	16.5	26.9

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