Tab. IV.

Continuous variables with statistically significant relationship to indoor mesophilic, psichrophilic and fungi concentration.

		Mesophilic Bacteria (Mean CFU/m3)	Psichrophilic Bacteria (Mean CFU/m3)	Fungi (Mean CFU/m3)
	Variable	Correlation Coefficent (Pearson r)
Others ambient	Building age	0.629	-0.685	-0.624
	Air exchange rate	+1*	-1*	-1*
	Light exposure	-1*	+1*	+1*
	Ventilation system	-0.897	-0.992	-1**
	Mean indoor relative humidity	-0.424	0.831**	0.848*
	Mean indoor temperature	-0.73**	-0.005	0.187
	Mean outdoor temperature	-0.523	0.458	0.525
Books storage	Mean indoor relative humidity	0.657	0.999**	-0.967
	Mean indoor temperature	0.689	+1*	-0.977
	Mean outdoor temperature	0.669	+1**	-0.971

^*Correlation is significant at the 0.05 level;

^**Correlation is significant at the 0.01 level.