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Assessment of publication bias using Begg’s funnel plot and Egger’s test.
| Air Pollutants | p-Value from Egger’s Test | Begg’s Funnel Plot |
|---|---|---|
| PM2.5 | 0.40 | Symmetry |
| PM10 | 0.68 | Symmetry |
| NO2 | 0.41 | Symmetry |
Abbreviations: NO2, nitrogen dioxide; PM, particulate matter.
