Table 2.

Interobserver agreement between femoral version determination, as evaluated via Pearson’s correlation coefficient (r), and the mean difference (°) between observers along with the standard deviation of this difference, which indicates interobserver variance

Measurements compared	Pearson’s correlation coefficient (r)	Mean difference (SD)
ORTHO vs. RAD	0.661**	4.1 (4.4)
PGY4 vs. RAD	0.477**	4.9 (6.9)
PGY1 vs. RAD	0.139*	7.5 (6.6)
ORTHO vs. PGY4	0.543**	4.9 (6.4)
ORTHO vs. PGY1	0.061	7.7 (7.3)
PGY4 vs. PGY1	0.110	8.2 (8.1)
Ortho totala vs. RAD	0.599**	4.3 (4.0)

^aOrtho total = mean measurement of ORTHO, PGY4, PGY1

** p < 0.01; * p < 0.05