Journal of Experimental Orthopaedics

Table 1 Descriptive statistics for tunnel aperture measurements and comparison of means and variances between the wobble and non-wobble technique (n = 10 per group)

From: Drill wobble – effect on femoral tunnel aperture during anterior cruciate ligament reconstruction

				t test		Brown-Forsythe test
Dimension	Technique	Mean	SD	t ^a	p value	F ^b	p value
Antero-posterior	NW	7.3	0.1	−0.01	0.9	6.89	0.02^c
Antero-posterior	W	7.3	0.3
Proximo-distal	NW	7.7	0.1	1.91	0.1	1.61	0.2
Proximo-distal	W	7.6	0.3
Oblique	NW	8.1	0.2	0.76	0.5	0.06	0.8
Oblique	W	8.1	0.2
Length	NW	27.2	0.8	−2.05	0.1	0.01	0.9
Length	W	28.0	0.9

NW non-wobble, W wobble, SD standard deviation
^aDegrees of freedom for t = 18
^b(Numerator, Denominator) degrees of freedom for F = (1, 18)
^cstatistically significant

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