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Table 2 Prevalence ratios for MCV1 coverage to adjust for differences between indicators: an approach to comparing vaccination coverage indicators

From: Measles vaccination coverage estimates from surveys, clinic records, and immune markers in oral fluid and blood: a population-based cross-sectional study

Comparison indicator

Prevalence ratio [95% CI]

Reference indicator

Maternal report

Card + History

EPI records

Serum

Serum

1.026

0.954

0.952

–

[0.998, 1.056]

[0.914, 0.996]

[0.893, 1.015]

n = 342

n = 342

n = 278

EPI records

1.057

0.976

–

 

[1.024, 1.088]

[0.940, 1.013]

 

n = 891

n = 891

 

Card + History

1.077

–

  

[1.059, 1.096]

  

n = 1226

  

Maternal report

–

   
  1. Note: Estimates are prevalence ratios [95% confidence intervals] to estimate the degree of over- or underestimation for each method used. The prevalence ratio based on comparison indicator (row) divided by reference indicator (column). E.g. the maternal report indicator generates an MCV1 coverage estimate 7.7% higher (PrR: 1.077 = 0.9078/0.8426) than coverage estimated by card + history. Bold indicates statistical significance with a 5% two-sided alpha. Results from this study are presented as an example of a tool governments or EPI programs could develop to compare vaccination coverage estimates from different indicators.