. 2017 Jun 2;6(4):340–348. doi: 10.1055/s-0037-1603656

Table 4. Comparisons of detection of penetrated screws in central regions under oblique views.

Variable	n	Mean (SD)	p -Value
Screw 4	8 (1 mm and 2 mm)	10.75 (2.43) ^b	0.03
Screw 5		5.38 (5.76) ^a
Screw 6		7.00 (1.41) ^a,b
Screw 4	4 (only 1 mm)	8.50 (0.58) ^c	< 0.001
Screw 5		0.00 (0.00) ^a
Screw 6		5.75 (0.50) ^b
Screw 4	4 (only 2 mm)	13.00 (0.00) ^c	< 0.001
Screw 5		10.75 (0.50) ^b
Screw 6		8.25 (0.50) ^a

Abbreviation: SD, standard deviation.

Note: Scheffe's post hoc test: a < b < c.