TABLE 1

Comparison of Readings from Inward- and Outward-Facing TLDs

Group	Inward		Outward		P^*
	Mean	Variance	Mean	Variance
All subjects	1.84	2.59	1.26	1.09	0.00
General nuclear medicine	1.27	1.17	0.93	0.75	0.00
PET/CT	2.97	3.93	1.92	1.27	0.03

↵* (T < t) 2-tailed.
Data are in millisieverts.