Table 1.

Comparison of early and late groups

				correlation between precision and experience
	Early group (n = 100)	Late group (n = 261)	p-value	coefficient	p value
Mean anteroposterior stem-shaft angle in degrees (range)	2 (-20 to 28)	1 (-24 to 25)	0.107	0.64	< 0.001
Standard deviation of anteroposterior stem shaft angle in degrees	7	5	0.012
Mean lateral stem-shaft angle in degrees (range)	2 (-18 to 18)	3 (-19 to 25)	0.091	0.37	< 0.001
Standard deviation of lateral stem shaft angle in degrees	7	6	0.595
Mean acetabular cup inclination angle in degrees (range)	35 (14 to 54)	37 (18 to 65)	0.036	0.12	0.027
Standard deviation of acetabular cup inclination angle in degrees	8	7	0.275

NB: negative values indicate varus positioning in the anteroposterior plane, and anteversion in the lateral plane