Table 4.

Incidence of perioperative adverse events after total ankle arthroplasty in each subgroup

	Total	Perioperative adverse events	P-value
All	465	33 (7.1 %)
Age (year)			0.071
≤ 39	4	1 (25.0 %)
40–49	6	1 (16.7 %)
50–59	56	8 (14.3 %)
60–69	152	12 (7.9 %)
70–79	197	8 (4.1 %)
≥ 80	50	3 (6.0 %)
Sex
Male	76	6 (7.9 %)	0.767
Female	389	27 (6.9 %)
Body mass index
< 30	333	22 (6.6 %)	0.857
≥ 30	26	3 (11.5 %)
Missing	106	8 (7.5 %)
Smoking
Nonsmoker	322	19 (6.0 %)	0.128
Ex or current smoker	35	4 (11.4 %)
Missing	75	10 (13.3 %)
Charlson Comorbidity Index
0	423	26 (6.1 %)	0.001
≥ 1	42	7 (16.7 %)
Mean hospital volume (per year)
≤ 4	269	29 (10.8 %)	< 0.001
≥ 5	196	4 (2.0 %)
Underlying diagnosis
Osteoarthritis	286	13 (4.5 %)	0.007
Rheumatoid arthritis	179	20 (11.2 %)
Anesthesia time
< 200 min	270	7 (2.6 %)	< 0.001
≥ 200 min	195	26 (13.3 %)

The values in bold indicate significant differences at the 0.006 (=0.05/8) significance level