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Table 1 Assessment of observing study quality based on the standard recommended by AHRQ

From: The trend of lead poisoning rate in Chinese population aged 0–18 years old: a meta-analysis

Assessing principala
 Study question clearly focused
 Sampling of Study Population (Random, Convenient, Self-selected)
 Clear definition of including or excluding criteria
 Clear definition of research time
 Assessment of confounding effects of various factors (for example, age of the patients, patient sex)
 Appropriate measure of precision
 Clear description of response rate
 Clear description of dealing with missing data
 Conclusions supported by results with possible bias and limitations taken into consideration
  1. ascoring method: yes = 1; no or not mentioned = 0