Table 5.

Multiple logistic regression TKA (n = 6,123)

	LOS >4 days (n = 559)			90–days readmission (n = 499)			Specific complications (n = 122)
Variable	OR	95%CI	p-value	OR	95%CI	p-value	OR	95%CI	p-value
BMI			0.2			0.1			1
< 18.5	1.96	0.66–5.85	0.2	1.94	0.64–5.89	0.2	0.67	0.06–6.99	0.7
18.5–24.9	1	–	–	1	–	–	1	–	–
25.0–29.9	0.78	0.60–0.99	0.049	0.84	0.66–1.09	0.2	0.93	0.65–1.32	0.7
30.0–34.9	0.85	0.65–1.12	0.3	0.76	0.57–1.01	0.06	0.91	0.62–1.35	0.6
35.0–39.9	1.08	0.76–1.53	0.7	0.93	0.66–1.33	0.7	1.02	0.62–1.67	0.9
> 39.9	1.04	0.64–1.69	0.9	0.57	0.33–0.99	0.046	1.19	0.62–2.26	0.6
Age/year	1.04	1.02–1.05	< 0.001	1.01	1.00–1.02	0.04	1.01	0.99–1.02	0.2
Male vs female	1.01	0.82–1.24	< 0.001	1.31	1.07–1.59	0.008	1.10	0.84–1.44	0.5
Living			< 0.001			0.8			0.7
With others	1	–	–	1	–	–	1	–	–
Alone	1.60	1.31–2.00	< 0.001	1.05	0.85–1.28	0.7	0.98	0.74–1.30	0.9
Institution	1.21	0.37–3.97	0.7	3.15	1.20–8.25	0.02	0.64	0.07–6.35	0.7
Walking aid	2.43	1.98–2.98	< 0.001	1.66	1.34–2.06	< 0.001	1.27	0.93–1.73	0.1
Pre–op. anemia	1.70	1.34–2.15	< 0.001	1.41	1.10–1.82	0.007	0.96	0.65–1.43	0.8
Diabetes			0.4			0.4			0.3
No DM	1	–	–	1	–	–	1	–	–
IDDM	1.48	0.94–2.33	0.09	1.62	1.04–2.53	0.03	1.24	0.63–2.44	0.5
NIDDM	1.23	0.91–1.65	0.2	1.23	0.92–1.66	0.2	0.98	0.63–1.53	0.9
Hypertension	1.08	0.89–1.32	0.4	1.10	0.90–1.34	0.4	0.92	0.70–1.23	0.6
Anticoagulants	1.60	1.10–2.35	0.02	1.25	0.84–1.86	0.3	0.97	0.52–1.79	0.9
Cardiac disease	1.26	0.95–1.67	0.1	1.23	0.93–1.63	0.2	1.17	0.78–1.77	0.4
Pulmonary disease	1.35	0.99–1.83	0.05	1.18	1.36–2.41	< 0.001	1.29	0.84–1.98	0.2
Psychiatric disorder	2.11	1.70–2.62	< 0.001	1.47	1.16–1.85	0.001	1.26	0.91–1.75	0.2

For legends, see Table 4