Table 3.

Summary of Wilcoxon signed-rank test results.

Dust material		Test statistics
		N	Z	P
Quartz diorite	Respirable gravimetricb– Respirable personal gravimetrica	8	−2.52	0.01
	Respirable DustTrak DRXb– Respirable personal gravimetrica	23	−4.20	<0.01
	PM2.5 DustTrak DRXb – PM2.5 Gravimetricb	23	−1.58	0.11
	Total dust DustTrak DRXb – Total dust Gravimetricb	23	−3.82	<0.01
	Respirable DustTrak DRXb – Respirable Gravimetricb	8	−2.59	0.01
	Thoracic Gravimetricb – PM10 DustTrak DRXb	23	−4.20	<0.01
Rhomb porphyry	Respirable gravimetricb– Respirable personal gravimetrica	11	−2.93	0.00
	Respirable DustTrak DRXb– Respirable personal gravimetrica	23	−4.20	<0.01
	PM2.5 DustTrak DRXb – PM2.5 Gravimetricb	23	−1.83	0.07
	Total dust DustTrak DRXb – Total dust Gravimetricb	23	−4.02	<0.01
	Respirable DustTrak DRXb – Respirable Gravimetricb	11	−2.97	0.00
	Thoracic Gravimetricb – PM10 DustTrak DRXb	23	−2.92	<0.01
Lactose	Respirable gravimetricb– Respirable personal gravimetrica	4	−1.83	0.07
	Respirable DustTrak DRXb– Respirable personal gravimetrica	24	−4.29	<0.01
	PM2.5 DustTrak DRXb – PM2.5 Gravimetricb	24	−0.32	0.75
	Total dust DustTrak DRXb – Total dust Gravimetricb	24	−4.29	<0.01
	Respirable DustTrak DRXb – Respirable Gravimetricb	4	−1.86	0.06
	Thoracic Gravimetricb – PM10 DustTrak DRXb	23	−3.41	0.00

^aPersonal sample.

^bStationary sample. Bold p-values indicate insignificant differences between samples.