Table 3 Distribution of 598 baseline study participants by strength of evidence for workplace exacerbation of asthma.

Exposure score†	Work related symptom score				Total
	0	1	2	3
0	215‡	92	15	13	335
	None	Weak	Weak	Moderate*
1	121	66	22	11	220
	Weak	Moderate*	Moderate*	Strong*
2	19	19	3	2	43
	Weak	Moderate*	Strong*	Strong*
Total	355	177	40	26	598

*23% (n = 136) of the 598 study participants had moderate or strong evidence, and were classified as having workplace exacerbation of asthma.

†Based on the higher of two scores for sensitiser and irritant agents, as independently assigned by two researchers after review of each participant's work history for the 12 months before interview.

‡Includes 41 participants who were unemployed during the 12 months before interview.