Letter re Marsh et al

Figures & data

Table 1.  Comparison of fiber counts (number of fibers) recorded on Dr Roggli’s laboratory count sheets with tissue levels of commercial amphiboles and tremolite (fibers per gram of wet lung tissue for fibers 5 microns or greater in length) reported in Table 1 of Marsh et al. Discrepancies between the Laboratory count sheets and the published Table are indicated with *.

Case	Source	Uncoated fibers	Amosite	Crocidolite	Total commercial amphiboles	Tremolite
1	Lab sheet	5	0	0	0*	1
	Marsh table 1				3270*	2180
2	Lab sheet	12	6	0	6	0*
	Marsh table 1				3970	440*
3	Lab sheet	14	1	0	1	0*
	Marsh table 1				970	4110*
4	Lab sheet	5	0	0	0	0*
	Marsh table 1				<580	1160*
5	Lab sheet missing. I retrieved data from summary sheet	8			0	2
	Marsh table 1				<580	1160
6	Lab sheet	3	0	0	0*	1
	Marsh table 1				490*	490
7	Lab sheet	2	1	0	1	0
	Marsh table 1				340	<340
8	Lab sheet	49	1	0	1	1
	Marsh table 1				120**	240**
9a	Lab sheet	9	0	1	1	1
	Marsh table 1				6000**	3280**
9b	Lab sheet	26	0	4	4	4
	Marsh table 1				6000**	3280**
10	Lab sheet	16	2	0	2	3
	Marsh table 1				1440	2170

**Number of amphibole and tremolite fibers identical, but concentrations reported to be different.