Table 1. Anthropometric characteristics of the study group ^*.

N = 738	Conv Trainee	Conv Senior	Nav Trainee	Nav Senior
Number of TKAs	N = 97	N = 115	N = 195	N = 331
Age (years)	67.8 ± 9.6	67.6 ± 9.6	66.5 ± 9.5	67.7 ± 8.8
Gender (male)	31 (32.0%)	37 (32.2%)	75 (38.5%)	166 (50.2%)
ASA-Class 1	7 (7.2%)	8 (7.0%)	17 (8.7%)	39 (11.8%)
ASA-Class 2	47 (48.5%)	59 (51.3%)	103 (52.8%)	154 (46.5%)
ASA-Class 3	43 (44.3%)	47 (40.9%)	75 (38.5%)	136 (41.1%)
ASA-Class 4	0 (0.0%)	1 (0.9%)	0 (0.0%)	2 (0.6%)
Length of hospital stay (d)	9.6 ± 1.6	9.7 ± 1.9	9.5 ± 1.5	9.6 ± 1.8

* For categorical data values are given as counts and percentages, for quantitative data values are given as mean ± standard deviation.

TKA = total hip arthroplasty, Conv = conventional TKA, Nav = navigated TKA, ASA = American Society of Anesthesiologists