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Table 3 Concentration indices and key statistics

From: Equity of access to maternal health interventions in Brazil and Colombia: a retrospective study

Interventions Brazil Colombia
C Mean coverage rates (μ) C normalized = (C/1 - μ) SE (C) t (C) Low High C Mean coverage rates (μ) C normalized = (C/1 - μ) SE (C) t (C) Low High
ANC (4 visits or more) 0.022 0.91 0.506 0.013 1.70 -0.004 0.048 0.024 0.93 0.329 0.008 3.13 0.008 0.039
SBA 0.032 0.93 0.836 0.013 2.37 0.005 0.059 0.035 0.94 0.612 0.015 2.36 0.005 0.065
C-section 0.207 0.39 0.362 0.055 3.74 0.095 0.318 0.097 0.35 0.150 0.029 3.30 0.038 0.157
PNC (within 2 months after birth) 0.277 0.32 0.456 0.068 4.05 0.14 0.415 0.123 0.27 0.168 0.028 4.32 0.066 0.180
  1. SE standard errors, t (C) = t-values and Low and High are the 95% confidence intervals limits
  2. The t variable for C is defined as t = C/SE(C)
  3. The critical value tα/2 of the variable t for the confidence intervals is obtained from the t distribution for α/2 (2, 5%) level of significance and 38–40 df (degrees of freedom)
  4. The 95% confidence interval for C is given by: C ± tα/2 SE (C)
  5. SBA skilled birth assistance, PNC postnatal care