Table V.

Correlation of cumulative total dust exposure and cumulative abnormal rate of pulmonary function in the non-smoking subgroup.

Cumulative total dust exposure (mg/m3 years)	Subject no. at the beginning of the period	Subject no. at the end of the period	Morbidity	Abnormal rate	Accumulative abnormal rate
0	176	0	0	0.0000	0.0000
100	176	6	1	0.0058	0.0058
200	170	5	1	0.0060	0.0117
300	165	6	2	0.0123	0.0182
400	159	7	2	0.0129	0.0250
500	152	9	4	0.0271	0.0396
600	143	7	5	0.0358	0.0620
700	136	8	5	0.0379	0.0724
800	128	7	5	0.0402	0.0765
900	121	13	7	0.0611	0.0988
1,000	108	11	8	0.0780	0.1344
1,100	97	19	9	0.1029	0.1729
1,200	78	16	12	0.1714	0.2567
1,300	62	21	12	0.2330	0.3645
1,400	41	15	10	0.2985	0.4620
1,500	26	13	9	0.4615	0.6223
1,600	13	4	3	0.2727	0.6084
1,700	9	9	3	0.6667	0.7576