Table 1.

Summary of the abnormalities seen on chest radiographs in both groups of candidates

	pre-EG	post-EG	P
Total number of candidates	4 333	3 379
Number of candidates with all abnormalities (lung parenchyma, pleural, cardiac, mediastinal)*	30 (0.69%)	53 (1.57%)	0.002
Number of candidates with lung parenchymal, pleural and mediastinal abnormalities	14 (0.32%)	44 (1.30%)	<0.001
Abnormalities requiring further investigations	18 (0.42%)	20 (0.59%)	0.272
Abnormalities confirmed on further investigations†	7 (0.16%)	13 (0.38%)	0.055
Number of candidates with a final diagnosis of tuberculosis	1 (0.02%)	5 (0.15%)	0.051

*Refer to Table 2 for a detailed list of abnormalities. ^†Refer Table 3 for the list of abnormalities confirmed on further investigations. pre-EG: Pre-exposure group. post-EG: Post-exposure group