Table 2.

Factors associated with a positive result for the top five allergens/irritants identified by any series (adjusted analysis, showing significant results only)

Substance	Variable	P value	Exp(B) with 95% CI
Nickel sulfate	–	–	–
PPDb	Agea	0.015	1.03 (1.01–1.05)
	Year of testinga	0.011	0.79 (0.66–0.95)
MBTb + Mercapto mix	Year of testinga	0.001	0.69 (0.56–0.87)
Potassium dichromate	Males (vs. females)	0.018	2.53 (1.17–5.49)
Thiuram mix	–	–	–

^aper each increment of an year, ^bPPD- p-phenylenediamine (PPD), MBT −2-mercaptobenzothiazole