This study aims to explore changes in cardiopulmonary function and other health indicators in primary school students with the intervention of air purifiers on a randomized controlled trial.
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Changes of heart rate variability
Timeframe: Baseline and after the completion of intervention period (4 months anticipated)
Changes of forced expiratory volume in 1 s (FEV1)
Timeframe: Baseline and after the completion of intervention period (4 months anticipated)
Changes of forced vital capacity (FVC)
Timeframe: Baseline and after the completion of intervention period (4 months anticipated)
Changes of forced expiratory volume in 1 s (FEV1) / forced vital capacity (FVC) ratio
Timeframe: Baseline and after the completion of intervention period (4 months anticipated)
Changes of peak expiratory flow (PEF)
Timeframe: Baseline and after the completion of intervention period (4 months anticipated)
Changes of fractional exhaled nitric oxide (FeNO) levels
Timeframe: Baseline and after the completion of intervention period (4 months anticipated)
Changes of fractional exhaled carbon monoxide (FeCO) levels
Timeframe: Baseline and after the completion of intervention period (4 months anticipated)
Changes of blood pressure
Timeframe: Baseline and after the completion of intervention period (4 months anticipated)