Table 6.

Prognostic factors for outcomes and costs for knee osteoarthritis, where *p ≤ 0.05.

	In-hospital mortality, odds ratio (95% CI)	Readmission, odds ratio (95% CI)	Reintervention, odds ratio (95% CI)	ICU admission, odds ratio (95% CI)	Length of stay, coefficient (95% CI)	Total in-hospital costs, coefficient (95% CI)
Total knee arthroplasty for osteoarthritis (TKA)
Age	1.09* (1.04; 1.13)	1.02* (1.01; 1.03)	0.97* (0.95; 1.00)	1.00 (0.98; 1.01)	0.00* (0.00; 0.00)	1.002* (1.002; 1.002)
Female sex	0.82 (0.43; 1.57)	0.67* (0.57; 0.78)	0.72 (0.43; 1.19)	0.56* (0.44; 0.71)	0.01* (0.00; 0.01)	1.006* (1.002; 1.010)
Elixhauser Comorbidity score	1.16* (1.11; 1.22)	1.08* (1.06; 1.10)	0.99 (0.90; 1.10)	1.18* (1.16; 1.21)	0.00* (0.00; 0.01)	1.005* (1.004; 1.006)
# Hospitalizations in 365 days prior to treatment	1.33 (0.02; 5.42)	23.40* (15.67; 35.18)	3.60 (0.86; 8.09)	1.54 (0.68; 3.08)	0.49* (0.47; 0.51)	1.635* (1.601; 1.670)
# Days in hospital in 365 days prior to treatment	1.08 (0.93; 1.24)	0.55* (0.43; 0.70)	0.68 (0.25; 1.81)	1.03 (0.93; 1.16)	0.03* (0.03; 0.04)	1.033* (1.030; 1.037)
SES 2	0.83 (0.40; 1.73)	1.15 (0.95; 1.40)	0.84 (0.48; 1.47)	1.41* (1.03; 1.92)	0.01* (0.00; 0.01)	1.007* (1.002; 1.012)
SES 3	0.62 (0.27; 1.40)	1.16 (0.94; 1.43)	0.52 (0.25; 1.09)	1.47* (1.05; 2.06)	0.01* (0.01; 0.02)	1.014* (1.009; 1.020)