Skip to main content

Table 5 Observed number of cardiovascular deaths (Obs) and standardised mortality ratio (SMR) and rate ratio (RR) with 95% confidence intervals of patients with metal-on-metal and metal-on-polyethylene total hip prostheses stratified by number of postoperative years.

From: A retrospective comparative study of mortality and causes of death among patients with metal-on-metal and metal-on-polyethylene total hip prostheses in primary osteoarthritis after a long-term follow-up

Follow-up time,

completed years

Metal-on-metal prosthesis (n = 579)

Metal-on-polyethylene prosthesis (n = 1585)

  
 

Obs

SMR

95% CI‡

Obs

SMR

95% CI

RR

95% CI

0-1

7

0.46

0.04-1.27

27

0.50

0.03-0.41***

0.91

0.98 - 1.163

2-9

75

0.81

0.62-1.32

193

0.70

0.61-0.96*

1.16

0.88 - 1.52

10-19

103

0.85

0.86-1.59

326

0.97

0.67-1.02

0.87

0.69 - 1.10

20+

115

1.40

0.50-1.30

156

1.40

0.61-1.24

1.00

0.78 - 1.28

Total

300

0.96

0.78-1.18

702

0.90

0.66-0.87 ***

1.07

0.93 - 1.22

  1. ‡ 95% CI, 95% confidence interval
  2. *p < 0.05, **p < 0.01, *** p < 0.001