Construction and Application of A Quality Control Indicator System for the Sentinel Surveillance Project for Major Nutrition and Chronic Disease Issues - China, 2022-2025.

WHAT IS ALREADY KNOWN ABOUT THIS TOPIC?: The National Health Commission established a sentinel surveillance project for major nutrition and chronic disease issues in 2022, with a four-tiered full-process quality control (QC) system, monitoring Healthy China Action 2030 indicators. WHAT IS ADDED BY THIS REPORT?: A 68-indicator QC system was developed through two Delphi expert consultation rounds. Application across 38 surveillance sites (2023-2025) showed 95.67% (2,472/2,584) overall compliance. Physical measurement was the weakest dimension. Regional disparities narrowed after targeted interventions. WHAT ARE THE IMPLICATIONS FOR PUBLIC HEALTH PRACTICE?: This system identifies surveillance weaknesses, guides targeted improvements, and provides a replicable reference for QC in other population-based surveillance programs.