Table 4.

Effect of mask wearing on PAH metabolites (multiplicative scale)

PAH metabolite	Mask effect	Mask effect (adjusted)	Mask effect (per protocol)	Test for period effect	Test for carry-over
1-hydroxynapthalene	0.86 (0.77,0.96); p = 0.007	0.86 (0.77,0.96); p = 0.007	0.87 (0.77,0.98); p = 0.02	p = 0.38	p = 0.85
2-hydroxynapthalene	0.95 (0.84,1.08); p = 0.42	0.95 (0.84,1.08);p = 0.47	0.96 (0.83,1.1); p = 0.54	p = 0.41	p = 0.98
2-hydroxyfluorene	0.98 (0.9,1.07); p = 0.61	0.98 (0.9,10.07); p = 0.66	0.97 (0.88,1.07); p = 0.58	p = 0.34	p = 0.56
3-hydroxyfluorene	0.97 (0.88, 1.06); p = 0.48	0.97 (0.88, 1.06); p = 0.5	0.97 (0.87, 1.08); p = 0.58	p = 0.05	p = 0.6
9-hydroxyfluorene	0.94 (0.85, 1.04); p = 0.23	0.94 (0.85, 1.04); p = 0.22	0.95 (0.85, 1.06); p = 0.33	p < 0.001	p = 0.59
1-hydroxyphenanthrene	0.97 (0.89, 1.07); p = 0.58	0.98 (0.89, 1.08); p = 0.66	0.98 (0.88, 1.08); p = 0.65	p = 0.11	p-0.59
2-hydroxyphenanthrene	1.02 (0.92, 1.12); p = 0.72	1.02 (0.93, 1.13); p = 0.67	1.02 (0.91, 1.14); p = 0.74	p = 0.45	p = 0.15
3-hydroxyphenanthrene	1.01 (0.92, 1.1); p = 0.88	1.01 (0.92, 1.11); p = 0.85	1.03 (0.93, 1.14); p = 0.6	p = 0.69	p = 0.63
4-hydroxyphenanthrene	0.96 (0.86, 1.08); p = 0.53	0.97 (0.86, 1.09); p = 0.59	0.97 (0.86, 1.1); p = 0.66	p = 0.01	p = 0.46
1-hydroxyprene	1.00 (0.92, 1.09); p = 0.98	1.00 (0.92, 1.09); p = 0.96	1.01 (0.92, 1.11); p = 0.84	p < 0.001	p = 0.42

Effects are displayed as estimate (95% confidence interval); p-value.