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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 0.02c
W 7.3 0.3     
Proximo-distal NW 7.7 0.1 1.91 0.1 1.61 0.2
W 7.6 0.3     
Oblique NW 8.1 0.2 0.76 0.5 0.06 0.8
W 8.1 0.2     
Length NW 27.2 0.8 −2.05 0.1 0.01 0.9
W 28.0 0.9     
  1. NW non-wobble, W wobble, SD standard deviation
  2. aDegrees of freedom for t = 18
  3. b(Numerator, Denominator) degrees of freedom for F = (1, 18)
  4. cstatistically significant