Table 3.

Results from decomposition analysis for Korean adults, KNHANES 1998–2015.

Variables	Wave 1 (1998)				Wave 4 (2007–2009)				Wave 6 (2013–2015)
	Elasticity	CI	Contribution	%	Elasticity	CI	Contribution	%	Elasticity	CI	Contribution	%
Gender (ref. Male)
Female	0.133	−0.005	−0.001	−3.85	−0.386	−0.007	−0.067	−6.65	−0.490	−0.007	0.003	−4.36
Age (ref. 19–34)
35–49	0.108	0.140	0.015	82.53	0.077	0.243	0.019	−45.81	0.050	0.227	0.011	−14.92
50–64	0.090	−0.157	−0.014	−77.21	0.098	−0.030	−0.003	7.26	0.072	0.041	0.003	−3.85
65+	0.011	−0.401	−0.004	−23.90	0.019	−0.463	−0.009	21.65	0.030	−0.428	−0.013	17.09
Education level (Ref. Elementary)
Middle school	0.005	−0.050	0.000	−1.36	−0.015	−0.095	0.001	−3.48	−0.018	−0.171	0.003	−3.98
High school	−0.078	0.105	−0.008	−44.44	−0.093	0.120	−0.011	27.38	−0.090	0.083	−0.008	9.89
College or more	−0.063	0.307	−0.019	−105.06	-0.087	0.347	−0.030	73.39	−0.102	0.302	−0.031	40.62
Income (Ref. Q1)
Q2	0.019	−0.225	−0.004	−23.72	0.010	−0.200	−0.002	5.04	−0.005	−0.207	0.001	−1.37
Q3	0.015	0.183	0.003	14.97	−0.012	0.147	−0.002	4.34	−0.005	0.154	−0.001	0.99
Q4	0.032	0.660	0.021	116.36	−0.001	0.633	−0.001	1.67	−0.022	0.626	−0.014	18.51
Employment (ref. White collar)
Blue collar	0.022	0.159	0.004	19.14	0.010	0.125	0.001	−3.01	0.005	0.088	0.000	−0.52
Nonworking	−0.038	−0.137	0.005	28.72	−0.041	−0.132	0.005	−13.23	−0.002	−0.110	0.000	−0.33
Unemployment	−0.032	−0.095	0.003	16.75	−0.025	−0.112	0.003	−6.82	−0.021	−0.150	0.003	−4.11
Marital status (ref. Married or partnered)
Singled	−0.040	−0.108	0.004	23.56	0.016	0.069	0.001	−2.70	0.029	0.071	0.002	−2.72
Place of residence (ref. Metro-Seoul region)
Non-metro Seoul region	0.000	0.118	0.000	0.03	0.014	0.090	0.001	−3.11	−0.002	0.066	0.000	0.21
Self-rated health
Fair	−0.024	0.059	−0.001	−7.60	0.010	0.045	0.000	−1.15	0.041	0.009	0.000	−0.46
Bad	−0.019	−0.190	0.004	19.62	0.032	−0.225	−0.007	17.53	0.034	−0.220	−0.007	9.84
Sum			0.006				−0.099				−0.046
Residual (Total C-Sum)			0.012				0.058				−0.030
Total CI for obesity			0.018				−0.041				−0.0760