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Table 3 Summary of decomposition analysis

From: Socioeconomic inequalities in hypertension in Kenya: a decomposition analysis of 2015 Kenya STEPwise survey on non-communicable diseases risk factors

Category

Characteristics

Coeff.

Elasticity

C

Cont. to C

%

Adjusted %a

Sociodemographic variables

Female gender (Ref: male)

− 0.057

−0.132

0.122

−0.016

20.1

10.5

Married (Ref: unmarried)

0.009

0.024

−0.040

−0.001

1.2

0.6

Age, years (Ref: 18−29 years)

     

4.3

30–39

0.071

0.077

−0.004

−0.0003

0.4

0.2

40–49

0.191

0.131

−0.049

− 0.006

7.9

4.1

50+

0.386

0.318

0.123

0.039

−48.8

 

Socioeconomic variables

Education (Ref: No formal)

     

9.4

Primary incomplete

−0.015

−0.014

0.255

−0.004

4.7

2.5

Primary complete

0.045

0.055

−0.117

−0.006

8.0

4.2

Secondary+

0.007

0.007

−0.594

−0.004

5.1

2.7

Occupation (Ref: Unemployed)

      

Self-employment

−0.001

−0.002

−0.033

0.0001

−0.1

 

Paid employment

0.031

0.022

−0.475

− 0.011

13.3

7.0

Wealth Index (Ref: Poorest)

    

−0.8

11.7

Poorer

0.023

0.018

0.499

0.009

11.2

5.9

Middle

−0.018

− 0.014

0.0002

0.000

0.0

 

Richer

0.008

0.023

−0.500

0.003

−4.0

 

Richest

−0.009

0.007

−1.000

− 0.007

8.5

4.5

Health behaviours

Current smokers (Ref: No)

−0.028

−0.013

0.281

− 0.004

4.4

2.3

Current alcohol use (Ref: No)

0.068

0.054

−0.038

−0.002

2.6

1.4

Insufficient fruits/vegetable intake

0.024

0.080

0.023

0.002

−2.3

 

Physical activity (Ref: High)

      

Moderate

−0.009

−0.005

−0.156

0.001

−1.0

 

Low

0.032

0.015

0.084

0.001

−1.5

 

Metabolic risk factor

Body mass index (Ref: Normal)

     

47.1

Undernutrition

−0.089

−0.055

0.386

−0.021

26.8

14.1

Overweight

0.090

0.064

−0.227

− 0.015

18.1

9.5

Obese

0.200

0.100

−0.359

− 0.036

44.9

23.5

Geographical factors

Urban residence (Ref: rural)

−0.013

−0.024

−0.388

0.009

−11.6

 

Regions (Ref: Rift Valley)

    

11.6

7.1

Eastern

0.021

0.014

− 0.011

−0.0002

0.2

0.1

Nyanza

−0.016

−0.008

0.076

− 0.006

0.7

0.4

Coast

−0.050

− 0.023

0.013

−0.0003

0.4

0.2

Central

0.063

0.028

−0.325

−0.009

11.4

6.0

Western

−0.008

−0.003

−0.043

0.0001

−0.2

 

North Eastern

−0.005

−0.001

0.644

−0.007

0.8

0.4

Nairobi

−0.067

−0.004

−0.541

0.002

−2.5

 
 

Concentration index

  

−0.081

   

Standard error

  

0.029

   

Residuals

  

−0.0002

   

95% CI

 

−0.138 to − 0.024

  
  1. Bold: p < 0.05. Coeff. coefficient (marginal effects); C concentration index; Cont to C: contribution to concentration index; % percentage contribution; Ref reference category; SE standard error; a The absolute contribution of each determinant was divided by the total explained portion that make contributions to the same direction of the concentration index.