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