Effects of Ventilation Improvement on Measured and Perceived Indoor Air Quality in a School Building with a Hybrid Ventilation System.

Int J Environ Res Public Health · 2018 · PMC6068750 · PMID 29976864

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extremely significantp = 0.000not a probability at all

However, when tested by the independent two-sample t -test (2-tailed), the difference in CO 2 concentrations before and after the ventilation improvement is statistically extremely significant at the 100% confidence interval ( p = 0.000 in Classroom 1, 387 and 740 measurement points; p = 0.008 in Classroom 2, 387 and 718 measurement points).

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