Table 2.

Summary of the study subjects’ demographics and operative time

Demographic	Patient-specific instrumentation (n = 23)	Conventional instrumentation (n = 22)	p value
Mean age (range) in years	66.9 (52.2–77.1)	68.2 (51.0–88.2)	n.s.
Sex (M:F)	10:13	13:9	n.s.
Median ASA (range)	2 (1–3)	2 (1–3)	n.s.
Mean body mass index (range)	29.8 (23.8–40.3)	31.8 (22.2–39.5)	n.s.
Mean operative time (range) in minutes	75.3 (53.0–90.0)	63.5 min (50.0–82.0)	0.001**

ASA American Society of Anaesthesiologists grade

** Statistically significant difference