2023-07-16-世界卫生组织-Immunization_Belarus_2023_country_profile_17页_353kb

WHO and UNICEF National Immunization Coverage Estimates Summary

Core Content

WHO and UNICEF jointly estimate national immunization coverage levels to provide a more accurate picture of immunization system performance. These estimates are based on a variety of data sources, including administrative, official, and survey-based data. The estimates are not based on ad hoc adjustments but rather on a systematic review of available data, with consideration of potential biases and expert opinions. When data are missing for a specific country/vaccine/year, interpolation from nearby years is used to estimate the coverage.

Main Vaccines and Coverage Definitions

Key Information

• Estimation Methods:

  • WHO and UNICEF estimates are country-specific and not borrowed from other countries.
  • When no data are available for a specific year, they are interpolated from nearby years.
  • For mixed data sources, the most likely estimate is selected with consideration of potential biases.

• Grade of Confidence (GoC):

  • The GoC reflects the empirical support for the estimates and not the quality of data reported by national authorities.
  • It is not based on classical measures like confidence intervals.
  • GoC is determined by the presence of supporting data sources:
    • R+: Supported by reported data.
    • D+: Supported by independent denominator data.
    • S+: Supported by at least one survey within 2 years.
    • R- / D- / S-: Challenges to the estimate.
  • In cases where no data sources challenge the estimate, it is considered well-supported.

• Data Sources:

  • Administrative Coverage: Based on reports from health service providers.
  • Official Coverage: Estimated by national authorities using a combination of administrative, survey, or other data.
  • Survey Coverage: Based on population-based household surveys among children aged 12-23 months or 24-35 months.

• Data Limitations:

  • No nationally representative household survey has been conducted in the last 5 years for most countries.
  • MICS 2019 did not include an immunization module.
  • Survey data is not available for many years, especially in recent years.

Summary Table

Notes on GoC

• GoC=R+ D+: Estimate is supported by reported data and independent denominator.
• GoC=R+ D+ S+: Estimate is supported by reported data, independent denominator, and at least one survey within 2 years.
• GoC=●●: Well-supported estimate.
• GoC=●: Estimate is supported by at least one data source.
• GoC=NA: No survey data available.

Disclaimer

• The data and estimates provided are based on varying quality information.
• The World Health Organization and United Nations Children's Fund take all reasonable precautions to verify the information, but they cannot guarantee its accuracy.
• Users are advised to interpret and use the data with caution, considering the objective for which it is being used.