Table 5.

Adjusted binary logistic with revision within 2 years as endpoint. Cup order number has been entered as a numerical variable

	All revisions regardless of reason (n = 904)			Isolated cup revisions, excluding infections (n = 303)
	OR	95% CI	p-value	OR	95% CI	p-value
Age	1.0	1.0–1.0	0.6	1.0	1.0–1.0	0.5
Sex
Male	ref			ref
Female	0.7	0.6–0.8	< 0.001	1.1	0.9–1.4	0.4
Diagnosis
Primary osteoarthritis	ref			ref
Femoral neck fracture	2.5	2.0–3.0	< 0.001	2.9	2.0–4.1	< 0.001
Others	1.6	1.3–1.9	< 0.001	2.1	1.5–2.8	< 0.001
Surgery
Primary	ref			ref
Revision	1.8	1.4–2.1	< 0.001	3.5	2.6–4.6	< 0.001
Type of hospital
University	ref			ref
County	1.0	0.9–1.2	0.6	0.7	0.6–1.0	0.03
Rural	0.9	0.7–1.1	0.2	0.7	0.5–1.0	0.05
Private	1.3	1.0–1.6	0.04	1.0	0.6–1.5	0.9
Cup fixation
Cemented	ref			ref
Uncemented	1.4	1.2–1.6	< 0.001	1.3	1.0–1.8	0.03
Cup order number	1.0	1.0–1.0	1.0	1.0	1.0–1.0	0.7

OR: odds ratio; CI: confidence interval.