Table 1.

Age and sex-specific incidence rates for RTHA and total number of RTHA and primary THA in Spain (2001-8)

		2001	2002	2003	2004	2005	2006	2007	2008
Age		Rate/100, 000	Rate/100, 000	Rate/100, 000	Rate/100, 000	Rate/100, 000	Rate/100, 000	Rate/100, 000	Rate/100, 000	P*
40-54	Men	4.6	5.1	4.3	4.3	4.5	5.2	5.3	5.7	0.007
	Women	3.1	3.3	2.9	2.8	2.9	3.1	3.3	3.2	0.540
50-64	Men	14.3	12.4	14.9	14.9	13.5	14.5	15.2	15.2	0.100
	Women	14.9	13.5	13.4	11.2	11.9	12.7	12.2	13.1	0.054
65-74	Men	36.9	33.4	36.5	34.4	34.1	35.6	34.3	36.3	0.862
	Women	43.8	42.7	44.3	44.3	38.9	42.4	38.4	37.5	< 0.001
75-84	Men	40.6	44.6	44.2	48.6	54.0	51.9	52.3	55.2	< 0.001
	Women	53.8	57.3	61.8	61.7	61.7	66.8	64.7	65.6	< 0.001
≥ 85	Men	19.3	22.3	21.8	22.0	25.2	26.1	22.9	30.0	< 0.001
	Women	27.7	26.9	27.0	31.2	34.4	33.6	32.9	37.2	< 0.001
Total	Men	17.8	17.3	18.0	18.0	18.3	18.9	18.8	19.8	0.107
	Women	22.3	22.1	22.8	22.4	21.6	23.1	21.9	22.2	< 0.001
	Both	20.2	19.9	20.6	20.4	20.1	21.1	20.4	21.1	0.016
Number of RTHA		3, 713	3, 699	3, 912	3, 964	3, 992	4, 294	4, 242	4, 464
Number of primary THA		18, 185	19, 029	19, 545	19, 733	20, 461	21, 176	21, 354	22, 308
Ratio RTHA/THA %		20.42	19.44	20.02	20.09	19.51	20.28	19.87	20.01	0.077

Incidence rates (number of cases per year sex and age group/corresponding number of person in that population group that year)

*P value for time trend estimated using Poisson regression models