Table 7.

Relative risks (RR) of revision for the Spectron prosthesis (Cox regression). Parameters with a value of 1 are reference

		RR	95% CI	p-value
Dislocation
Age, years	< 60	0.7	0.2–3.1	0.6
	60–75	1.2	0.6–2.1	0.7
	> 75	1
Sex	Female	1
	Male	1.0	0.5–1.9	1.0
Order	First hip	1.6	0.6–4.5	0.4
	Second hip	1
Diagnosis	Osteoarthritis	1
	Fracture	4.8	2.5–9.0	< 0.001
	Other	1.4	0.4–4.9	0.6
Approach	ALT	0.2	0.1–0.4	< 0.001
	Posterior	1
Side	Right	1.0	0.5–1.8	1.0
	Left	1
Loosening
Age, years	< 60	7.1	3.8–13.2	< 0.001
	60–75	2.9	1.7–4.8	< 0.001
	> 75	1
Sex	Female	1
	Male	1.3	0.9–1.8	0.2
Order	First hip	0.7	0.5–1.1	0.2
	Second hip	1
Diagnosis	Osteoarthritis	1
	Fracture	0.8	0.5–1.6	0.6
	Other	1.1	0.6–2.1	0.7
Approach	ALT	1.6	1.0–2.5	0.04
	Posterior	1
Side	Right	1.1	0.8–1.5	0.7
	Left	1
Infection
Age, years	< 60	1.9	0.7–5.1	0.2
	60–75	1.2	0.6–2.4	0.6
	> 75	1
Sex	Female	1
	Male	2.9	1.6–5.5	< 0.001
Order	First hip	0.8	0.4–1.6	0.4
	Second hip	1
Diagnosis	Osteoarthritis	1
	Fracture	1.5	0.6–3.6	0.4
	Other	2.5	1.1–6.0	0.04
Approach	ALT	0.9	0.5–1.8	0.8
	Posterior	1
Side	Right	0.9	0.5–1.6	0.7
	Left	1