Geographic Distribution of Environmental Relative Moldiness Index Molds in USA Homes

Table 2

The SAS 9.2 VARCLUS procedure (SAS Inst., Inc., Cary, NC) was applied to standardized log data to divide the 36 species into disjoint clusters such that each species belonged to one and only one internally homogeneous cluster. All species began in a single cluster, which was split iteratively to maximize the variance accounted for by the cluster components. Splitting continued until the eigenvalue associated with each cluster’s second principal component reached the criterion of a maximum of 1.0.

Cluster		ERMI group	𝑅^2 own cluster	𝑅^2 next closest
(1)	Aspergillus ochraceus	1	0.340	0.096
	Aspergillus penicillioides	1	0.475	0.166
	Aspergillus restrictus	1	0.317	0.034
	Aspergillus sclerotiorum	1	0.353	0.048
	Aspergillus versicolor	1	0.379	0.098
	Scopulariopsis chartarum	1	0.361	0.129
	Wallemia sebi	1	0.509	0.141
(2)	Chaetomium globosum	1	0.514	0.148
	Cladosporium sphaerospermum	1	0.535	0.211
	Penicillium Group 2	1	0.198	0.053
	Trichoderma viride	1	0.478	0.116
(3)	Aspergillus fumigatus	1	0.325	0.133
	Paecilomyces variotii	1	0.474	0.102
	Penicillium brevicompactum	1	0.473	0.204
	Penicillium corylophilum	1	0.374	0.079
	Penicillium variabile	1	0.415	0.172
(4)	Penicillium purpurogenum	1	1.000	0.028
(5)	Acremonium strictum	2	0.543	0.109
	Alternaria alternata	2	0.576	0.137
	Cladosporium cladosporioides (Type 1)	2	0.755	0.310
	Cladosporium cladosporioides (Type 2)	2	0.478	0.229
	Cladosporium herbarum	2	0.507	0.121
	Epicoccum nigrum	2	0.648	0.349
(6)	Aspergillus flavus	1	0.299	0.013
	Aspergillus niger	1	0.429	0.090
	Aspergillus sydowii	1	0.375	0.059
	Aspergillus unguis	1	0.499	0.087
	Penicillium spinulosum	1	0.145	0.030
	Aspergillus ustus	2	0.433	0.127
	Penicillium chrysogenum (Type 2)	2	0.429	0.133
(7)	Aureobasidium pullulans	1	0.326	0.177
	Eurotium amstelodami	1	0.538	0.283
	Scopulariopsis brevicaulis	1	0.547	0.173
	Stachybotrys chartarum	1	0.429	0.163
	Mucor racemosus	2	0.469	0.179
	Rhizopus stolonifer	2	0.348	0.060