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Table 3 Categories and criteria for Groups A, B and C in WHO preterm birth estimates

From: Global, regional and national levels and trends of preterm birth rates for 1990 to 2014: protocol for development of World Health Organization estimates

  WHO Member States
  Group A country Group B country Group C country
Quality Criteria Source Specific criteria
1. Preterm birth data available Assess available CRVS data CRVS data for preterm birth are available, ie: Preterm birth rate is given or can be calculated CRVS data for preterm birth are available, ie: Preterm birth rate is given or can be calculated No CRVS for preterm birth available, or CRVS data available but country does not otherwise meet Group A or B criteria
2. Quality of civil registration system for births Civil registration coverage of births (%) CRVS coverage for births >80 % [20] (or country can be otherwise classified as having high coverage for birth registration) CRVS coverage for births is 60 % - <80 % [20] CRVS coverage for birth data is <60 % or unknown [20]
3. Volume of CRVS data Assess available CRVS data • ≥500 births
• Commencement date of data collection after 1/1/1990
• End date of data collection is before 31/12/2014
• Number of years where preterm data available is >50 % for the period 1990 to 2014 inclusive (i.e. CRVS data available for at least 13 years)
• ≥500 births
• Commencement date of data collection after 1/1/1990
• End date of data collection is before 31/12/2014
• Data for any year/s between 1990 to 2014 inclusive (but does not meet Group A criteria)
• No CRVS data on preterm birth available, or
• CRVS data on preterm birth available, but country does not otherwise meet Group A or Group B criteriaa
Data sources for development of estimates
Data sources: CRVS data only to be used Conduct systematic review of published studies to identify additional data sources Conduct systematic review of published studies to identify additional data sources
  1. aCountries that have CRVS data for preterm birth, but CRVS coverage for birth data is <60 % or unknown, will be considered Group C countries