. 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 III. Overall Comparison of the Modified ISO and ISO TEM Methods Second Laboratory Lab Data.

Zone	Stratum	Likelihood Ratio (χ²)	DF	LR P-value
1	<5 μm	10.2788	7	0.1733
1	5–14 μm	1.5754	3	0.6636
1	≥15 μm	4.8742	7	0.6753
9	<5 μm	13.6676	6	0.0336
9	5–14 μm	2.1396	3	0.5439
9	≥15 μm	4.8146	7	0.6826
	Overall LR χ²	37.3502	33	0.2759

Note: The ISO >5 μm stratum was partitioned into 5–14 μm and a ≥15 μm stratum for these analyses.