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Table 2 Comparison of the level of inequalities in child mortality and trends over time across ten African cities

From: Inequalities in child mortality in ten major African cities

   Earlier surveys More recent surveys
City (years) Measure of inequality Value 95% confidence interval Value 95% confidence interval
Cairo (2000, 2008) Difference (poor minus rich) 40.48 5.72 75.25 14.12 −22.04 50.28
Ratio (poor/rich) 2.98 1.10 8.10 1.44 0.56 3.72
Concentration index −0.18 −0.34 −0.02 −0.10 −0.27 0.06
Erreyger’s index −0.03 −0.05 0.00 −0.02 −0.04 0.01
Lagos (2003, 2008) Difference (poor minus rich) 155.90 55.01 256.79 22.94 −31.51 77.40
Ratio (poor/rich) n/a n/a n/a 1.38 0.63 3.03
Concentration index −0.28 −0.45 −0.11 −0.04 −0.15 0.07
Erreyger’s index −0.11 −0.18 −0.04 −0.01 −0.05 0.03
Kinshasa (2007) Difference (poor minus rich) - - - 56.79 10.35 103.24
Ratio (poor/rich) - - - 1.83 1.11 3.04
Concentration index - - - −0.11 −0.20 −0.03
Erreyger’s index - - - −0.04 −0.08 −0.01
Luanda (2011) Difference (poor minus rich) - - - 42.20 9.86 74.53
Ratio (poor/rich) - - - 1.90 1.17 3.10
Concentration index - - - −0.14 −0.22 −0.07
Erreyger’s index - - - −0.04 −0.06 −0.02
Abidjan (1998–99, 2011–12) Difference (poor minus rich) 62.61 2.14 123.08 107.80 54.99 160.61
Ratio (poor/rich) 1.93 1.01 3.68 4.43 1.97 9.97
Concentration index −0.10 −0.19 0.00 −0.16 −0.26 −0.07
Erreyger’s index −0.05 −0.09 0.00 −0.06 −0.10 −0.02
Dar es Salaam (1999, 2010) Difference (poor minus rich) 196.47 82.63 310.31 −20.05 −100.49 60.38
Ratio (poor/rich) 12.30 1.64 92.23 0.69 0.16 3.03
Concentration index −0.34 −0.48 −0.20 −0.05 −0.21 0.11
Erreyger’s index −0.16 −0.23 −0.09 −0.02 −0.09 0.05
Nairobi (1998, 2008–09) Difference (poor minus rich) 121.81 28.28 215.33 15.66 −31.49 62.82
Ratio (poor/rich) 9.89 1.27 77.07 1.45 0.47 4.48
Concentration index −0.31 −0.52 −0.09 −0.04 −0.19 0.12
Erreyger’s index −0.09 −0.15 −0.03 −0.01 −0.04 0.03
Dakar (1997, 2010–11) Difference (poor minus rich) 107.92 46.50 169.33 29.83 −9.64 69.30
Ratio (poor/rich) 3.04 1.56 5.93 1.97 0.80 4.88
Concentration index −0.19 −0.31 −0.08 −0.11 −0.25 0.02
Erreyger’s index −0.07 −0.11 −0.03 −0.02 −0.05 0.00
Addis Ababa (2000, 2011) Difference (poor minus rich) 96.39 31.58 161.20 57.97 5.46 110.49
Ratio (poor/rich) 2.35 1.29 4.28 2.87 1.05 7.83
Concentration index −0.18 −0.27 −0.10 −0.21 −0.37 −0.04
Erreyger’s index −0.09 −0.14 −0.05 −0.04 −0.08 −0.01
Accra (1998, 2008) Difference (poor minus rich) 8.53 −62.61 79.67 27.10 −29.41 83.61
Ratio (poor/rich) 1.17 0.32 4.25 2.72 0.29 25.51
Concentration index −0.13 −0.40 0.13 −0.25 −0.46 −0.03
  Erreyger’s index −0.03 −0.08 0.03 −0.05 −0.09 −0.01
  1. Note: The difference and the Erreyger’s index are measures of absolute inequality, while the ratio and the concentration index measure relative inequality.