Table 4.

Decomposition of concentration index of tobacco use prevalence (TP).

Independent Variables	Men			Women			All
	dy/dx	Cont.	%	dy/dx	Cont.	%	dy/dx	Cont.	%
Economic quantiles (Poorest †)
Poorer	0.0175	−0.0039	−9.27	−0.0064	0.0119	−29.79	0.0026	−0.0010	−2.40
Middle	0.0293 *	−0.0070	−16.83	0.0051	−0.0102	25.65	0.0150 *	−0.0067	−15.27
Richer	0.0168	−0.0016	−3.71	−0.0062	0.0048	−12.08	0.0040	−0.0007	−1.58
Richest	0.0568 ***	0.0431	103.20	0.0078	0.0494	−124.02	0.0325 ***	0.0456	104.53
Chronic	−0.0112	0.0000	0.00	0.0037	0.0000	0.00	−0.0024	0.0000	0.00
Education (Illiteracy †)
Primary school	−0.0160	0.0021	4.98	−0.0125 **	0.0136	−34.16	−0.0190 **	0.0046	10.49
Middle school	−0.0413 **	0.0017	3.96	−0.0141 **	0.0047	−11.86	−0.0297 ***	0.0022	5.05
High school and above	−0.0663 ***	−0.0144	−34.45	−0.0259 ***	−0.0471	118.36	−0.0495 ***	−0.0199	−45.57
Age (45–54 †)
55–64	−0.1086 ***	−0.0053	−12.72	0.0055	0.0023	−5.66	−0.0470 ***	−0.0043	−9.76
65–74	−0.1427 ***	0.0108	25.87	0.0080	−0.0051	12.71	−0.0641 ***	0.0090	20.56
75 and above	−0.2025 ***	0.0110	26.22	−0.0010	0.0004	−1.11	−0.1022 ***	0.0102	23.44
Housize	0.0084 **	−0.0049	−11.82	0.0005	−0.0025	6.23	0.0042 **	−0.0045	−10.41
Male							0.2684 ***	−0.0267	−61.08
Party	−0.0115	−0.0009	−2.18	−0.0068	−0.0045	11.35	−0.0187 *	−0.0028	−6.31
Area (Northwest †)
Southwest	0.0001	0.0000	0.00	−0.0051	0.0009	−2.16	−0.0026	0.0001	0.22
South middle	−0.0616 ***	0.0054	12.91	0.0006	−0.0005	1.19	−0.0282 **	0.0046	10.48
North	−0.0980 ***	−0.0046	−11.06	0.0511 ***	0.0202	−50.72	−0.0174	−0.0015	−3.48
East	−0.0521 *	−0.0002	−0.37	0.0432 ***	0.0011	−2.70	−0.0002	0.0000	0.00
Northeast	−0.0899 ***	−0.0076	−18.30	0.0088	0.0063	−15.81	−0.0380 ***	−0.0060	−13.70
Insurance (UEBMI †)
URBMI	−0.0200	0.0000	0.00	0.0170 *	0.0000	0.00	0.0083	0.0000	0.00
NRCMS	0.0281	0.0000	0.00	0.0295 ***	0.0000	0.00	0.0333	0.0000	0.00
Urban	−0.0066	−0.0008	−1.87	0.0138 ***	0.0137	−34.46	0.0067	0.0015	3.34
Marriage	0.0372 *	−0.0019	−4.58	0.0143 **	−0.0062	15.45	0.0381 ***	−0.0036	−8.33
Ethnicity	0.0696 ***	−0.0023	−5.58	0.0086	−0.0024	6.08	0.0355 ***	−0.0022	−5.04
Total contribution		0.0185	44.4		0.0508	−127.48		−0.0021	−4.82
Contribution of $\mathsf{\epsilon }$		0.0232	55.6		−0.0906	227.48		0.0457	104.82

Notes: * p < 0.1; ** p < 0.05; *** p < 0.01; dy/dx means partial effects of each variable and evaluated at sample means; Cont. means contribution to CI; % means the percentage of contribution to CI; ^† Reference levels in the regressions; UEBMI: the Urban Employment Basic Medical Insurance; URBMI: the Urban Resident Basic Health Insurance; NRCMS: the New Rural Cooperative Medical Scheme.