Table 5 Relative Index of Inequality (RII: wealth and education), and Concentration Index (wealth) for vaccination coverage among 12–23 months’ children by maternal education and household wealth quintile, Nepal Demographic and Health Surveys (2001–2016)

  Primary

1.5 (1.3,1.6)

1.2 (1.1,1.3)

1.2 (1.1,1.3)

1.1 (1.0,1.3)

0.0103

  Secondary

1.6 (1.4,1.8)

1.3 (1.2,1.4)

1.2 (1.1,1.3)

1.2 (1.0,1.3)

0.0018

  Higher education

1.6 (1.4,1.8)

1.3 (1.2,1.4)

1.2 (1.1,1.3)

1.3 (1.2,1.5)

0.0033

RII (95% CI)

0.3 (0.2,0.5)

0.5 (0.4,0.7)

0.7 (0.6,0.8)

0.7 (0.6,0.8)

0.0005

  Poorer

1.2 (1.0,1.4)

1.2 (1.1,1.4)

1.0 (0.9,1.1)

1.0 (0.9,1.1)

0.0788

  Middle

1.2 (1.0,1.4)

1.3 (1.1,1.5)

1.0 (0.9,1.1)

0.9 (0.8,1.0)

0.0030

  Richer

1.4 (1.1,1.7)

1.3 (1.2,1.5)

1.1 (1.0,1.2)

1.1 (1.0,1.2)

0.0175

  Richest

1.5 (1.3,1.8)

1.4 (1.2,1.6)

1.1 (1.0,1.2)

1.1 (0.9,1.2)

0.0019

RII (95% CI)

0.6 (0.5,0.8)

0.7 (0.5,0.8)

0.9 (0.8,1.0)

0.9 (0.8,1.0)

0.0026

Concentration Index (95% CI)

0.21 (0.12–0.28)

0.20 (0.12–0.29)

0.08 (0.02–0.13)

0.054 (−0.01–0.12)

na