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Table 3 Estimates of decomposition analysis for contribution of various explanatory variables for cognitive impairment among older adults

From: Assessing socioeconomic inequalities in cognitive impairment among older adults: a study based on a cross-sectional survey in India

Variables Coef. (95% CI) Elasticity CCI Absolute contribution to CCI % contribution
Self-perceived income sufficiency
 Has income and fully sufficient Ref.      
 Has income and partially sufficient 0.33*(0.19,0.46) 0.018 −0.065 − 0.001 2.5 3.0
 Has income and not sufficient 0.29*(0.07,0.52) 0.003 − 0.121 0.000 0.8
 No income 0.22*(0.07,0.37) 0.013 0.014 0.000 −0.4
Work Status (last one year)
 Never worked Ref.      
 Currently working −0.13(− 0.28,0.02) − 0.010 − 0.176 0.002 −3.9 0.7
 Retired − 0.26*(− 0.46,-0.07) − 0.004 0.516 −0.002 4.6
Educational status
 Not educated Ref.      
 Below 5 years −0.37*(− 0.51,-0.24) −0.011 − 0.001 0.000 0.0 44.6
 6 to 10 years −0.80*(− 0.94,-0.66) −0.041 0.259 −0.011 23.0
 11+ years −1.27*(−1.50,-1.04) −0.016 0.621 −0.010 21.5
Marital status
 Not in union Ref.      
 Currently in union −0.17*(−0.28,-0.05) − 0.019 0.039 − 0.001 1.6 1.6
Asset ownership
 No Ref.      
 Yes −0.19*(− 0.33,-0.06) −0.030 0.025 −0.001 1.6 1.6
Age group (in years)
 60-69 Ref.      
 70-79 0.39*(0.28,0.5) 0.019 −0.014 0.000 0.6 0.0
 80+ 0.65*(0.46,0.84) 0.012 0.024 0.000 −0.6
Gender
 Men Ref.      
 Women 0.04(−0.09,0.16) 0.009 −0.033 0.000 0.6 0.6
Co-residing with children
 No Ref.      
 Yes −0.05(−0.16,0.06) −0.008 0.090 −0.001 1.5 1.5
Self-rated health
 Good Ref.      
 Poor 0.25*(0.14,0.35) 0.033 −0.038 −0.001 2.7 2.7
IADL
 High Ref.      
 Low 0.23*(0.12,0.33) 0.028 −0.062 −0.002 3.7 3.7
ADL
 High Ref.      
 Low 0.65*(0.42,0.88) 0.005 −0.011 0.000 0.1 0.1
Subjective well-being
 High Ref.      
 Low 0.12*(0.02,0.25) 0.004 −0.283 −0.001 2.5 2.5
Psychological health
 High Ref.      
 Low 0.46*(0.32,0.6) 0.023 −0.233 −0.005 11.5 11.5
Wealth status
 Poorest Ref.      
 Poorer 0.08(−0.08,0.24) 0.002 −0.338 −0.001 1.7 31.8
 Middle −0.07(− 0.24,0.11) −0.001 0.140 0.000 0.4
 Richer −0.34*(− 0.53,-0.15) −0.014 0.522 −0.007 16.2
 Richest −0.36*(− 0.57,-0.16) −0.008 0.763 −0.006 13.6
Religion
 Hindu Ref.      
 Muslims −0.1(−0.31,0.11) −0.002 0.148 0.000 0.7 −1.5
 Sikh −0.08(− 0.31,0.16) 0.000 0.296 0.000 −0.3
 Others 0.26*(0.02,0.5) 0.003 0.319 0.001 −1.9
Caste
 Scheduled Caste Ref.      
 Scheduled Tribe 0.01(−0.24,0.26) 0.002 −0.445 − 0.001 2.2 3.7
 Other Backward Class −0.02(− 0.17,0.13) 0.005 − 0.029 0.000 0.3
 Others −0.04(− 0.18,0.11) −0.002 0.222 −0.001 1.2
Place of residence
 Rural Ref.      
 Urban −0.10(−0.21,0.01) 0.000 0.253 0.000 0.1  
State
 Himachal Pradesh Ref.      
 Punjab 0.14(−0.07,0.36) 0.000 0.318 0.000 0.2 −8.2
 West Bengal 1.48*(1.27,1.7) 0.028 −0.162 −0.005 10.0
 Orissa 0.50*(0.32,0.69) 0.011 −0.366 −0.004 8.6
 Maharashtra 0.14(−0.04,0.32) −0.001 − 0.116 0.000 − 0.2
 Kerala 0.85*(0.66,1.05) 0.022 0.351 0.008 −16.4
 Tamil Nadu −0.53*(−0.74,-0.33) − 0.022 −0.217 0.005 −10.4
Calculated CCI     −0.046 100.0 100.0
Actual CCI     −0.100   
Residual     −0.054   
  1. CI Confidence interval, CCI Concentration index, *if p > 0.05, % Percentage, IADL Instrumental activities of daily living, ADL Activities of daily living