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Table 4 Crude differences and Slope Index of Inequality (SII) for vaccination coverage among 12–23 months’ children by maternal education and household wealth quintile (2001–2016)

From: The trend of full vaccination coverage in infants and inequalities by wealth quintile and maternal education: analysis from four recent demographic and health surveys in Nepal

 2001200620112016P-value*
Rate difference (95% CI)
 No education (ref.)
  Primary26.2 (18.3,34.0)13.9(6.1,21.6)16.5 (8.5,24.6)8.0(−0.5,16.5)0.0184
  Secondary32.6 (25.1,40.1)23.4 (17.6,29.3)17.1 (9.0,25.2)12.0(3.5,20.6)0.0023
  Higher education33.9 (24.0,43.8)24.6 (18.7,30.5)14.3 (7.2,21.4)23.4 (16.3,30.6)0.0136
SII (95% CI)−61.8 (−73.5,-50.1)−47.9(−61.2,-34.6)−29.8 (−43.7,-15.8)−30.5 (−40.7,-20.2)< 0.0001
Rate difference (95% CI)
 Poorest (ref.)
  Poorer8.2(−1.6,18.0)14.4 (4.2,24.6)−0.7 (−9.0,7.6)0.5 (−8.8,9.9)0.0970
  Middle10.4 (−1.0,21.7)19.1 (9.0,29.3)−0.5(− 10.5,9.5)−5.8(− 15.1,3.6)0.0023
  Richer20.6(9.5,31.6)22.7(12.3,33.1)7.0 (−0.8,14.8)8.2 (−0.3,16.7)0.0355
  Richest27.4 (16.5,38.3)25.5 (15.3,35.6)11.2 (4.1,18.2)5.0(−5.8,15.8)0.0040
SII (95% CI)−32.3 (−45.5,-19.1)−32.8 (−45.7,-19.9)−12.6 (−21.6,-3.6)−8.4 (− 18.6,-1.7)< 0.0001
  1. *P value for test of heterogeneity in rate difference or SII across years
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