. Author manuscript; available in PMC: 2016 May 1.

Published in final edited form as: Am J Ind Med. 2015 Feb 12;58(5):494–508. doi: 10.1002/ajim.22422

Table II. Overall Inter-Laboratory Comparison Usingthe Modified ISO TEM Method.

Zone	Stratum	Likelihood ratio χ²	DF	LR P-value
1	<5 μm	28.6325	7	0.0002
1	5–14 μm	6.6353	3	0.0845
1	≥15 μm	4.4928	7	0.7216
9	<5 μm	11.3307	7	0.1248
9	5–14 μm	6.0999	3	0.1069
9	≥15 μm	9.0586	7	0.2484
	Overall LR χ²	66.2498	34	0.0008