Table 8.

Specific gravity-corrected urinary VOC biomarker concentrations (ng/mL) among hairdressers by services provided, products used, and PPE used on the day of biospecimen collection (N=23).^a

	VOC biomarker	Was service provided, product used or PPE used?b	n (%)	p50 (p25, p75)	p-valuec
Type of Service Provided
Semi-permanent hair coloring	HMFG	Yes	4 (17)	1360 (926, 1980)	0.04
		No	19(83)	481 (217, 1200)
	HMFA	Yes	4 (17)	17000 (9270, 23500)	0.02
		No	19(83)	3790 (1330, 10220)
	BZMA	Yes	4 (17)	41.8 (18.5, 91.9)	0.04
		No	19(83)	12.6 (7.47, 21.5)
	3MHA + 4MHA	Yes	4 (17)	432(342,574)	0.01
		No	19(83)	137 (85.8, 270)
	2MHA	Yes	4 (17)	62.6(45.9,76.6)	0.02
		No	19(83)	24.6 (18.1, 35.0)
Permanent hair coloring	MADA	Yes	5 (22)	196(124,199)	0.04
		No	18(78)	237 (194, 340)
	3HMPMA	Yes	5 (22)	424 (369, 452)	<0.0001
		No	18(78)	716(601,1250)
Extension no glue	HMFG	Yes	4 (17)	687 (405, 839)	0.03
		No	19(83)	248 (188, 378)
	2HPMA	Yes	4 (17)	78.0(67.1, 105)	0.04
		No	19 (83)	51.11 (34.7, 68.1)
	2CYEMA	Yes	4 (17)	4.59 (3.39, 181)	0.04
		No	19(83)	1.58 (1.32, 3.33)
	2MHA	Yes	4 (17)	72.6(38.6,123)	0.02
		No	19(83)	24.6 (18.1, 42.6)
Hair drying with blow dryer	2HEMA	Yes	8 (35)	1.73 (0.764, 2.27)	0.03
		No	15(65)	3.02 (1.61, 3.80)
Roller set	MUCA	Yes	6 (26)	32.5 (28.2, 54.6)	0.01
		No	17 (74)	93.5 (59.2, 171)
	2HP	Yes	6 (26)	33.7 (24.2, 39.1)	0.01
		No	17 (74)	58.9 (51.1, 80.6)
	2CYEMA	Yes	6 (26)	0.870 (0.439, 1.33)	<0.0001
		No	17 (74)	3.29 1.59, 4.55)
	2COEMA	Yes	6 (26)	121 (67.8163)	<0.0001
		No	17 (74)	279 (188, 316)
	3MHA + 4MHA	Yes	6 (26)	80.4 (69.0,137)	0.04
		No	17 (74)	200(133,346)
	2MHA	Yes	6 (26)	12.0 (4.39, 24.8)	0.02
		No	17 (74)	27.9 (23.9, 49.3)
Braids	2ATCA	Yes	3 (13)	1300 (826, 1500)	0.01
		No	20 (87)	335 (219, 544)
Hair washing	N2FG	Yes	14 (61)	3420 (1620, 8310)	<0.0001
		No	9 (39)	18200 (16900, 26600)
	HMFG	Yes	14 (61)	444 (191, 668)	<0.0001
		No	9 (39)	1470 (908, 1780)
	HMFA	Yes	14 (61)	2810 (930, 4850)	0.01
		No	9 (39)	11500 (7020, 13200)
	AMCA	Yes	14(61)	77.0 (65.5, 146)	0.01
		No	9(39)	217 (170, 297)
	2MHA	Yes	14(61)	22.3 (14.7, 27.9)	0.01
		No	9(39)	42.9(26.9, 75.9)
Type of PPE used
Gloves	MCAMA	Yes	14 (64)	106 (44.0, 204)	0.04
		No	8 (36)	54.6 (34.3, 76.9)
	BZMA	Yes	14 (64)	18.5 (12.6, 30.9)	0.02
		No	8 (36)	7.96 (5.37, 13.9)

^aAnalyses were only conducted where VOC biomarker concentration ≥ 60%.

^bBased on post work-shift questionnaire.

^cWilcoxon-Mann Whitney test was used to compare differences in median VOC biomarker concentrations Abbreviations: p#: represents percentiles.