Table 4.

Time-trends in patient characteristics (in %) by patient age category from 1993 to 2005 in patients undergoing primary TKA

	1993–1995	1996–1998	1999–2001	2002–2005	P-value
BMI ≥40
Age, <50	2.3	16.0	16.5	20.6	0.043
Age, 50-<65	10.2	12.7	17.9	19.2	0.001
Age, 65- <80	3.9	5.9	6.9	7.2	0.006
Age ≥80	0.6	2.0	1.8	2.0	0.72
Diagnosis of RA/inflammatory arthritis
Age, <50	48.7	19.6	16.2	9.8	<0.001
Age, 50-<65	13.9	7.8	3.1	1.2	<0.001
Age, 65- <80	3.9	4.2	2.9	1.0	<0.001
Age ≥80	0.6	2.8	1.8	1.2	0.48
Deyo-Charlson Index ≥3
Age, <50	9.1	2.0	3.8	8.5	0.25
Age, 50-<65	7.1	7.4	10.6	12.7	0.01
Age, 65- <80	13.0	15.0	19.4	25.1	<0.001
Age ≥80	15.2	19.2	31.3	38.9	<0.001
Depression
Age, <50	2.3	10.0	8.8	17.1	0.041
Age, 50-<65	4.4	7.4	11.1	18.1	<0.001
Age, 65- <80	4.0	7.0	9.8	12.6	<0.001
Age ≥80	4.4	5.3	9.6	17.0	<0.001
Anxiety
Age, <50	0	4.0	3.8	7.0	0.27
Age, 50-<65	1.7	4.8	6.3	8.9	<0.001
Age, 65- <80	5.2	5.1	5.0	8.5	<0.001
Age ≥80	2.5	7.9	6.6	12.1	0.005