2010-09-17-世界卫生组织-The_EVM_Site_Selection_Tool_User_Guide_23页_837kb

EVM Site Selection and User Guide Summary

1. Technical Terms and Acronyms

   • EVM: Effective Vaccine Management.
   • LD Store: Lowest delivery level store.
   • PR Store: Primary store.
   • SN Store: Sub-national store.
   • SP: Service Delivery Point.

2. Principles

   • The sampling methodology is based on systematic and random sampling.
   • Sample size is determined based on the target population or total population if data is unavailable.
   • Confidence levels (80%, 85%, 90%) and precision levels (±5%, ±10%, ±15%) guide sample selection.

3. Detailed Steps for Site Selection

   • Step 1: List all supply chain facilities and create a hierarchical table.
   • Step 2: Assign population data to each LD store and calculate cumulative population.
   • Step 3: Use the sample size reference table to determine the number of sites.
   • Step 4: Calculate the sampling interval.
   • Step 5-8: Select LD stores, service delivery points, and higher-level stores systematically based on random selection and population weighting.

4. EVM Site Selection Tool

   • An Excel-based tool is provided for automated site selection.
   • The tool includes features for listing facilities, calculating sample size, and random selection.
   • Users can follow step-by-step instructions to generate a representative sample.

5. Annex 1 – Sample Size Reference Table

   • Provides sample sizes for different combinations of LD stores, confidence levels, and precision.
   • Default recommendation: 80% confidence level and ±10% precision.

6. Revision History

   • Document and tool updated periodically to align with changes in methodology and user feedback.

This document outlines a standardized methodology for selecting EVM sites, ensuring representative sampling across vaccine supply chains.