Table 1.

Primary drill pedicle perforations (PDPP) and secondary screw pedicle perforations (SSPP)

Skill level	Group	PDPP	SSPP
			6 mm	7 mm	8 mm
Expert	FH	0	2	3	8
	AR	0	3	3	6
	p	–	0.321	0.325	0.196
Novice	FH	3	18	20	22
	AR	1	7	10	15
	p	0.615	0.006	0.013	0.053