Table 5. Hazard Rate Ratios (HRR) with: (i) 1:1 matching for being diagnosed with any type of cancer following stemmed MoM in men (a: n = 17,450; 1,879 were subsequently diagnosed with cancer) and women (c: n = 16,930; 1,437 were subsequently diagnosed with cancer), and MoM hip resurfacings in men (b: n = 23,722; 1,529 were subsequently diagnosed with cancer) and women (d: n = 10,672; 704 were subsequently diagnosed with cancer).

(ii) 1:4 matching for being diagnosed with any type of cancer following stemmed MoM in men (a: n = 41,000; 4,462 were subsequently diagnosed with cancer) and women (c: n = 41,815; 3,704 were subsequently diagnosed with cancer), and MoM hip resurfacings in men (b: n = 38,350; 2,684 were subsequently diagnosed with cancer) and women (d: n = 20,425; 1,375 were subsequently diagnosed with cancer).

Bearing type for first primary hip	(i) 1:1 matching			(ii) 1:4 matching
	Total number of cases (number who developed cancer)	HRR [95% CI]	p-value	Total number of cases (number who developed cancer)	HRR [95% CI]	p-value
Men
(a)	17,450 (1,879)			41,000 (4,462)
Other		1 [referent]			1 [referent]
MoM		0.98 [0.89–1.07]	p = 0.592		1.00 [0.93–1.07]	p = 0.966
(b)	23,722 (1,529)			38,350 (2,684)
Other		1 [referent]			1 [referent]
Resurfacing		0.88 [0.80–0.97]	p = 0.013		0.84 [0.76–0.92]	p<0.001
Women
(c)	16,930 (1,437)			41,815 (3,704)
Other		1 [referent]			1 [referent]
MoM		0.98 [0.88–1.09]	p = 0.702		0.92 [0.85–1.00]]	p = 0.060
(d)	10,672 (704)			20,425 (1,375)
Other		1 [referent]			1 [referent]
Resurfacing		0.95 [0.83–1.10]	p = 0.521		0.97 [0.85–1.11]	p = 0.697