Table 5

Discriminatory power of cumulative CBC results and TLD doses reported to screen ‘High-Risk’ radiation workers among 145 workers whose FISH doses were ≥250 mGy

(A) Ratio of FISH doses vs TLD doses
FISH dose/TLD dose*	HR radiation workers		Total	p Value†	OR (95% CI)
FISH dose/TLD dose*	CBC-HR	TLD-HR	Total	p Value†	OR (95% CI)
≥5	25	57	82	<0.001	8.772 (2.510 to 30.655)
<5	3	60	63	<0.001	8.772 (2.510 to 30.655)
Total	28	117	145

(B) Annual FISH doses from working duration
Annual FISH dose‡	HR radiation workers		Total	p Value†	OR (95% CI)
Annual FISH dose‡	CBC-HR	TLD-HR	Total	p Value†	OR (95% CI)
≥50 mGy	10	17	27	0.010	3.268 (1.291 to 8.270)
<50 mGy	18	100	118	0.010	3.268 (1.291 to 8.270)
Total	28	117	145

*Ratio of FISH doses to TLD doses ≥5 means ‘high-risk’ radiation workers because they had lower frequency of TLD-wearing during working periods.
†Significant difference between the groups as determined by Pearson's χ² test.
‡Annual FISH doses ≥50 mGy means ‘high-risk’ radiation workers because they were exposed by IR during working periods.
CBC-HR, complete blood cell count-high risk; IR, ionising radiation; FISH, fluorescence in situ hybridisation; TLD-HR, thermoluminescent dosimeter-high risk.