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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