. 2021 Jan 26;195:110805. doi: 10.1016/j.envres.2021.110805

Table 3.

Classroom CO₂ concentrations, temperature, and RH.

Variable	Heating season				Cooling season				P-value for paired T-test
Variable	Mean	Median	Std	Range	Mean	Median	Std	Range	P-value for paired T-test
CO₂ (ppm)	980	890	310	510–1900	990	800	460	430–2200	0.325
RH (%)	31	30	8.9	8.7–56	53	52	12	26–82	<0.001
Temperature (°C)	23.4	23.4	1.9	19.6–29.5	24.2	24.1	1.3	21.7–27.7	0.038