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Table 1 Summary of published studies retrospectively estimating measles case fatality ratios and conducted by the authors

From: Challenges in measuring measles case fatality ratios in settings without vital registration

Reference Location Study type Sampling Recall Period Study dates Case Ascertainment Lab Confirmation Case Fatality Ratio
21 Mirrah district, Niger Retro-spective 22 villages from 5 health districts selected based on number of cases and ability to lab confirm outbreak Jan 1 - Apr 15 2003 May 24 - June 28 2003 House to house search; house-hold census in houses reporting
cases; repeat visits to confirm deaths
5-10 serum samples in 12 of 22 villages surveyed 9.7% (95% CI: 7.9 - 11.5)
24 Boukoki, Niamey,
Niger
Retro-spective
community-based
One neighborhood selected based on population size and feasibility Approx 6 months preceding survey May 5 - 12, 2004 House to house search, collection of demographic and measles case data in all households At least 10 cases lab-confirmed per epidemic 4.6% in children aged < 5 yrs
22 White Nile and Khartoum states, North Sudan Retro-spective
community-based
One administrative unit in each of two states selected on basis of number of measles cases; within each administrative unit, 10 villages randomly selected Oct 1 2003 - Apr 30 2004 May 17 - July 8, 2004 House to house search for measles cases; house-hold census in houses reporting
cases
Laboratory confirmation in each administrative unit 0.9% (95% CI: 0.16 - 1.91)
28 Nepal -- nationwide Retro-spective
community-based
Two stage random sampling for a total of one outbreak from each of 37 districts March 1 - Sept 1 2004 Sept 2004 - Jan 2005 House to house search for measles cases; house-hold census in houses reporting
cases
Laboratory confirmation of outbreaks 1.1% (95% CI: 0.5 - 2.3)
24 Moursal, Ndjamena, Chad Retro-spective
community-based
One neighborhood selected based on population size and feasibility Approx 6 months preceding survey July 4 - 12, 2005 House to house search, collection of demographic and measles case data in all household At least 10 cases lab-confirmed per epidemic 4.0% in children aged < 5 yrs
24 Dong District, Nigeria Retro-spective
community-based
One neighborhood selected based on population size and feasibility Approx 6 months preceding survey Apr 25 - May 2, 2005 House to house search, collection of demographic and measles case data in all household At least 10 cases lab-confirmed per epidemic 10.8% in children aged < 5 yrs