Statistical Evaluation of Indoor Air Quality Parameters in Classrooms of a University

Table 3

The correlation coefficients and significance levels between the parameters.

Parameters		Number of people	Temperature; (indoor)	Relative humidity; (indoor)	CO2; (indoor)	PM0.5; (indoor)	PM1; (indoor)	PM2.5; (indoor)	PM5.0; (indoor)	PM10; (indoor)	Radon; (indoor)	Temperature (outdoor)	Relative humidity; (outdoor)	CO2; (outdoor)
Temperature; (indoor)	Pearson correlation	−,145
	Sig. (2-tailed)	,092
		136
Relative humidity; (indoor)	Pearson correlation	,098	−,540
	Sig. (2-tailed)	,258	,000
		136	136
CO2; (indoor)	Pearson correlation	,768	−,409	,290
	Sig. (2-tailed)	,000	,000	,001
		136	136	136
PM0.5; (indoor)	Pearson correlation	,233	−,226	,199	,326
	Sig. (2-tailed)	,006	,008	,020	,000
		136	136	136	136
PM1; (indoor)	Pearson correlation	,182	−,178	,112	,261	,800
	Sig. (2-tailed)	,034	,038	,193	,002	,000
		136	136	136	136	136
PM2.5; (indoor)	Pearson correlation	,224	−,198	,145	,305	,871	,961
	Sig. (2-tailed)	,009	,021	,093	,000	,000	,000
		136	136	136	136	136	136
PM5.0; (indoor)	Pearson correlation	,236	−,274	,160	,306	,825	,873	,920
	Sig. (2-tailed)	,006	,001	,063	,000	,000	,000	,000
		136	136	136	136	136	136	136
PM10; (indoor)	Pearson correlation	,263	−,324	,173	,372	,740	,797	,839	,931
	Sig. (2-tailed)	,002	,000	,045	,000	,000	,000	,000	,000
		136	136	136	136	136	136	136	136
Radon; (indoor)	Pearson correlation	,166	,019	,016	−,074	−,041	−,111	−,089	−,081	−,090
	Sig. (2-tailed)	,122	,861	,881	,495	,702	,303	,410	,453	,406
		88	88	88	88	88	88	88	88	88
Temperature; (outdoor)	Sig. (2-tailed)	−,056	,796	−,680	−,401	−,249	−,197	−,219	−,261	−,332	,084
		,515	,000	,000	,000	,003	,022	,011	,002	,000	,431
		136	136	136	136	136	136	136	136	136	89
Relative humidity; (outdoor)	Pearson correlation	,072	−,559	,940	,287	,197	,105	,127	,129	,138	,039	−,698
	Sig. (2-tailed)	,404	,000	,000	,001	,021	,224	,141	,135	,109	,718	,000
		136	136	136	136	136	136	136	136	136	89	136
CO2; (outdoor)	Pearson correlation	−,122	,039	−,135	−,110	−,203	−,229	−,202	−,221	−,202	,199	,200	−,063
	Sig. (2-tailed)	,157	,655	,117	,204	,018	,007	,019	,010	,018	,062	,020	,466
		136	136	136	136	136	136	136	136	136	89	136	136
PM10; (outdoor)	Pearson correlation	,044	,118	−,236	,061	,387	,447	,471	,539	,580	,012	,220	−,285	,141
	Sig. (2-tailed)	,607	,170	,006	,481	,000	,000	,000	,000	,000	,911	,010	,001	,101
		136	136	136	136	136	136	136	136	136	89	136	136	136

correlations which are significant with respect to . correlations which are significant with respect to α = 0,01.