Table 1.

Descriptive characteristics of patients with osteoarthritis of the hip or knee who underwent implant surgery between 1977–2007 and who were alive on 1 January 1986

			Implant surgery
Characteristic	Total	%	Hip	%	Knee	%
Both genders	134 176	100	90 024	67.1	44 152	32.9
Male	54 624	40.7	39 298	43.6	15 326	34.7
Female	79 552	59.3	50 726	56.3	28 826	65.3
Year of birth
< 1900	460	0.3	392	0.4	68	0.2
1900–1920	39 087	29.1	29 438	32.5	9 649	21.9
1921–1930	36 346	27.1	24 477	27.2	11 869	26.9
1931–1940	31 459	23.4	20 029	22.2	11 430	25.9
1941–1950	19 560	14.6	11 302	12.6	8 258	18.7
1951–1960	5 627	4.2	3 292	3.7	2 335	5.3
> 1960	1 637	1.2	1 094	1.2	543	1.2
Age at cohort entry (years)
35–49	6 963	5.2	4 813	5.3	2 150	4.9
50–64	38 320	28.6	24 705	27.4	13 615	30.8
65–79	71 334	53.2	48 197	53.5	23 137	52.4
80–94	17 491	13.0	12 243	13.6	5 248	11.9
≥ 95	68	0.1	66	0.1	2	0.0
Follow-up (years)
0–4	59 046	44.0	35 915	39.9	23 131	52.4
5–9	38 125	28.4	26 280	29.2	11 845	26.8
10–14	21 352	15.9	15 224	16.9	6 128	13.9
15–19	10 453	7.8	8 089	9.0	2 364	5.4
≥ 20	5 200	3.9	4 516	5.0	684	1.5
Censoring of follow-up due to
Parkinson disease	668	0.5	452	0.5	216	0.5
Death	47 023	35.0	35 460	39.4	11 563	26.2
Emigration	198	0.1	125	0.1	73	0.2
31 December 2007	86 287	64.3	53 987	60.0	32 300	73.2