. 2019 Jul 18;17(3):714–723. doi: 10.5114/aoms.2019.86709

Table VI.

Positive patch test reactions to other chemicals of the para group in individuals with primary allergy to PPDA depending on patch test reaction grade

	Grade of reaction to PPDA	Primary allergy to PPDA total, N = 124	Only PPDA, N = 100, n (%)	PPDA + other para group chemicals, N = 24
	Grade of reaction to PPDA	Primary allergy to PPDA total, N = 124	Only PPDA, N = 100, n (%)	1 allergen, N = 16	2 allergens, N = 7	3 allergens, N = 1	Total, n (%)
1	+	51	45 (88.2)	6	0	0	6 (11.7)
2	++	40	32 (80.0)	6	2	0	8 (20)
3	+++	33	23 (69.7)	4	5	1	10 (30.3)
			NS	NS	1 vs. 3, p = 0.042	1 vs. 3, p = 0.2187	1 vs. 3, p = 0.0348

N – number of patients with positive patch test results, PPDA – paraphenylenediamine.