Table 2.

Risk ratios and 5-year survival estimates for revision due to deep infection. The risk ratios and survival estimates are adjusted for sex, age, diagnosis, prosthesis, operation room ventilation, duration of operation, and antibiotic prophylaxis

Prosthesis	Time period	No. of THAs included	No. of THAs revised due infection	Risk ratio	p-value	95% CI	5-year survival
All THAs	1987–1992	20,913	134	1			99.7
	1993–1997	22,519	156	1.3	0.03	1.0–1.7	99.6
	1998–2002	26,230	150	1.5	0.003	1.2–2.0	99.5
	2003–2007	27,682	174	3.0	< 0.001	2.2–4.0	99.1
Cemented THAs	1987–1992	17,867	119	1			99.7
	1993–1997	19,191	133	1.3	0.04	1.0–1.7	99.5
	1998–2002	22,558	129	1.5	0.008	1.1–2.1	99.5
	2003–2007	23,380	136	2.7	< 0.001	1.9–3.7	99.2
Uncemented THAs	1987–1992	3,046	15	1			99.8
	1993–1997	3,328	23	1.2	0.6	0.6–2.4	99.8
	1998–2002	3,672	21	1.4	0.3	0.7–2.9	99.6
	2003–2007	4,302	38	5.3	< 0.001	2.6–10.7	98.9
Charnley with antibiotics in the cement and systemically	1987–1992	4,321	26	1			99.7
	1993–1997	7,776	46	1.1	0.6	0.7–1.9	99.6
	1998–2002	9,301	44	1.1	0.9	0.6–1.8	99.6
	2003–2007	5,925	37	2.0	0.02	1.1–3.5	99.3