Table 4.

Taper and trunnion fretting and corrosion scores according to head size

Head size (mm)	Taper fretting [mean (95% CI)]	Taper corrosion [mean (95% CI)]	Trunnion fretting [mean (95% CI)]	Trunnion corrosion [mean (95% CI)]
≤ 26 (n = 26)	2.1 (1.7–2.5)	2.4 (2.1–2.6)	1.9 (1.8–2.06)	1.6 (1.5–1.8)
28 (n = 46)	1.9 (1.7–2.1)	2.7 (2.5–2.9)	1.9 (1.8–2.0)	1.7 (1.6–1.8)
32 (n = 53)	2.1 (1.9–2.3)	2.3 (2.1–2.5)	2.0 (1.9–2.1)	1.8 (1.7–1.9)
≥ 36 (n = 30)	2.2 (1.8–2.6)	2.4 (2.0–2.8)	2.1 (1.9–2.2)	1.9 (1.8–2.1)

CI = confidence interval.