Table 1.

Duration of surgery and radiation dose

	N	SI Screw Fixation	Removal	p
Duration of surgery [min]	19
total		29.0 (11.4)	37.6 (14.8)	.075
per screw		15.2 (5.3)	21.3 (6.3)	.005
Radiation dose [mGy]	13
total		27.2 (19.3)	27.5 (21.2)	.845
per screw		11.4 (6.5)	13.0 (8.6)	.845

Data reported as mean and standard deviation (in brackets)

min minutes, mGy Milli-Gray