Explaining income-related inequalities in cardiovascular risk factors in Tunisian adults during the last decade: comparison of sensitivity analysis of logistic regression and Wagstaff decomposition analysis

Saidi, Olfa; Zoghlami, Nada; Bennett, Kathleen E.; Mosquera, Paola Andrea; Malouche, Dhafer; Capewell, Simon; Romdhane, Habiba Ben; O’Flaherty, Martin

doi:10.1186/s12939-019-1047-6

International Journal for Equity in Health

Table 4 Decomposition of the concentration index of high cardiovascular risk prevalence among Tunisian adults in2005 and 2016

From: Explaining income-related inequalities in cardiovascular risk factors in Tunisian adults during the last decade: comparison of sensitivity analysis of logistic regression and Wagstaff decomposition analysis

	2005						2016
	Coef	Elast	CI	Cont to C	% cont	% Adj	Coef	Elast	CI	Cont to C	% cont	% Adj
Gender						1.0						2.1
Female (Ref)
Male	0.004	0.015	0.129	0.002	1.7	1.0	0.021	0.048	0.070	0.003	3.9	2.1
Age						4.8						6.3
35–44 years (Ref)						0.0						0.0
45–54 years	0.071	0.221	0.043	0.010	8.2	4.8	0.133	0.203	0.050	0.010	12.0	6.3
55–64 years	0.150	0.249	− 0.032	− 0.008	−6.9	0.0	0.184	0.238	−0.081	− 0.019	− 22.7	0.0
65–70 years	0.162	0.158	− 0.157	− 0.025	− 21.3	0.0	0.238	0.106	− 0.179	− 0.019	− 22.2	0.0
Area						34.6						40.3
Rural (ref)						0.0						0.0
Urbain	0.032	0.174	0.398	0.069	59.5	34.6	−0.079	−0.131	− 0.497	0.065	76.4	40.3
Region						21.8						4.6
District of Tunis (Ref)						0.0						0.0
North_east	−0.049	−0.063	0.014	−0.001	− 0.7	0.0	0.006	0.004	0.043	0.000	0.2	0.1
North_west	−0.060	− 0.085	−0.232	0.020	17.0	9.9	0.003	0.002	−0.275	−0.001	− 0.7	0.0
Central_east	−0.016	−0.022	0.244	−0.005	−4.6	0.0	0.022	0.016	0.252	0.004	4.8	2.5
Central_west	−0.046	−0.068	− 0.262	0.018	15.2	8.9	−0.013	−0.009	− 0.265	0.002	2.7	1.4
South_east	−0.052	−0.071	0.035	−0.002	−2.1	0.0	−0.053	− 0.034	−0.024	0.001	0.9	0.5
South_west	−0.054	−0.078	− 0.078	0.006	5.2	3.0	−0.001	−0.001	0.060	0.000	0.0	0.0
Education Level						13.8						14.0
Illiterate	0.015	0.060	−0.412	−0.025	−21.3	0.0	0.082	0.091	−0.509	−0.047	−54.6	0.0
Primary	0.038	0.125	−0.008	−0.001	− 0.9	0.0	0.071	0.134	−0.220	−0.029	−34.4	0.0
Secondary	0.042	0.066	0.421	0.028	23.7	13.8	0.052	0.068	0.334	0.023	26.6	14.0
University (ref)						0.0						0.0
Occupation						13.2						13.6
Unemployed	−0.022	−0.106	−0.216	0.023	19.7	11.5	−0.021	−0.045	− 0.202	0.009	10.7	5.7
Workers	−0.028	−0.084	− 0.041	0.003	3.0	1.7	−0.039	−0.077	− 0.167	0.013	15.0	7.9
Medium	−0.014	−0.006	0.683	−0.004	−3.7	0.0	−0.016	− 0.005	0.506	− 0.002	−2.7	0.0
High (Ref)						0.0						0.0
Household income						10.8						19.2
Lowest quintile	−0.035	−0.068	−0.993	−0.067	−57.7	0.0	−0.022	−0.022	− 0.999	0.022	25.4	13.4
2	−0.021	−0.041	− 0.507	0.021	17.8	10.3	0.004	0.004	−0.498	−0.002	−2.1	0.0
3	−0.006	−0.011	0.001	0.000	0.0	0.0	0.024	0.023	0.005	0.000	0.1	0.1
4	0.001	0.002	0.498	0.001	0.7	0.4	0.019	0.019	0.498	0.009	10.9	5.7
Highest quintile (ref)				0.000		0.0						0.0
C (conindu)	0.116						0.085
Residual	0.055						0.042

^aCoeff coefficient, Elas elasticity, C concentration index, Cont. to C contribution to concentration index, % percentage contribution, Adj % Adjusted percentage

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