Table 4.

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

	1993-1995	1996-1998	1999-2001	2002-2005	P-value
BMI ≥40
Age, <50	1.1	7.3	7.2	5.8	0.30
Age, 50- < 65	3.5	5.3	7.1	9.3	0.007
Age, 65- <80	2.4	1.3	4.6	5.7	<0.001
Age ≥80	0	0	1.3	2.2	0.17
Diagnosis of RA/inflammatory arthritis
Age, <50	17.9	10.5	6.2	4.2	<0.001
Age, 50- < 65	2.6	3.3	1.9	1.0	0.11
Age, 65- <80	3.5	4.2	2.3	1.2	0.002
Age ≥80	0	0	1.4	0	0.11
Deyo-Charlson Index ≥3
Age, <50	5.7	1.7	4.8	4.8	0.16
Age, 50- < 65	4.1	6.7	7.8	8.2	0.13
Age, 65- <80	16.1	12.7	19.8	19.9	<0.001
Age ≥80	20.8	24.1	21.9	27.2	0.51
Depression
Age, <50	2.9	3.0	6.0	8.3	0.02
Age, 50- < 65	5.4	4.8	8.7	9.4	0.02
Age, 65- <80	4.7	5.2	6.8	9.1	0.002
Age ≥80	4.0	6.3	7.1	15.8	0.001
Anxiety
Age, <50	1.7	0.9	2.4	2.9	0.41
Age, 50- < 65	2.2	2.2	4.9	3.9	0.12
Age, 65- <80	4.1	5.1	4.8	6.6	0.14
Age ≥80	3.4	3.5	4.9	5.7	0.06

Significant p-values are in bold, calculated with chi-squared test.