Document jNVzwgy4Vq4NwgBpk9Davz68Q

I 102 G. Berry, J. C. Gilson, S, Holmes, H. C. Lewinsohn, andS. A. Roach Asbesi Table 2 Summary of exposure at factory Exposure factors Year started at factory 1933-35 1936-40 1941-45 1946-50 1951-55 1956-60 1961-65 Workers first employed before 1951 Total With signs 11 7 50 21 28 u _93 23 __ ---- Workers first employed after 1950 Total With signs .. , -- __ , 109 75 13 ___ ___ ___ 22 6 2 50- V) 1 t0' I 30tj r !0- s g n- Maximum annual time-weighted average concentration (f/cm#) <5 5-9-99 10-19-99 20-50 1 38 70 73 Cumulative exposure* (f-yr/cm*) <50 50-99 100-149 150-199 200-249 250-549 5 25 36 44 39 33 Time since first employed at factory* (yr) <10 1 10-14 0 15-19 17 I 20-24 25-29 65 51 30-39 48 Age* (yr) <40 40-44 45-49 I I 50-54 55-59 60-72 3 5 22 34 52 66 0 11 9 82 26 92 27 12 1 36 6 95 12 52 17 14 11 ___ 15 -- 09 0 74 12 J-114 19 16 15 0 36 0 25 8 31 13 35 22 33 19 37 l 9 18 2 4 12 13 1 -- 1 16 13 0 3 4 4 11 8 U 0J Fig. 2 asbesti interp expos1 with i havei dusty Thf presse foragi was r 1950 i within Table ive e> Table Total 182 62 197 30 Cumuta. For those with signs, these are calculated up to the first occurrence of the signs. Table 3 Number ofmen with crepitations recorded by factory medical officer or by Pneumoconiosis Medical Panel Examiner and opinion Pneumoconiosis Medical Panel Yes No Total Factory medical officer Yes No 51 27 31 268 82 295 Total 78 299 377 in whom crepitations were heard at the factory but were not heard by the PMP. RELATIONSHIP BETWEEN POSSIBLE ASBESTOSIS AND CERTIFICATION Except for the one man who was certified after death, and had not been seen in the factory medical department within the previous 10 years, all the certified cases were also in the possible category. An analysis, using life-table techniques, has been carried out on the interval between suspicion and certification. The results are given in Figure 2, which shows the cumulative percentage of certified cases plotted against time since suspicion; 25% became certified within 15 months of suspicion and 50% within 3-5 yr, Of 19 men who were uncertified after five years' follow-up since first suspicion, only one was subsequently certified in, on average, a further two years' follow-up. RADIOLOGICAL FINDINGS, LUNG FUNCTION AND EXPOSURE The profusion of small opacities and bilateral pleural thickening have been related to cumulative dust exposure (Table 4). Again, these data cannot be (f.yrlcm First en <25 25-4 50-2 75-9 100-1 125-1 150-1 175-1 200-2 225-2 >250 Total First en <25 25-4 50-7 75-9 100-1 125-1 >150 Total Averaj cases be tAt leai