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Table 5 Numbers of deaths (No), mortality rates (deaths per 1000 person-years), and rate ratios (RRs) in two periods according to two population-based cohort studies

From: Long-term secular trends in dermatomyositis and polymyositis mortality in the USA from 1981 to 2020 according to underlying and multiple cause of death mortality data

Authors, year

 

(1) Period 1

 

(2) Period 2

 

(2)/(1)

(Location)

Myopathy

No

Rate

 

No

Rate

 

RR

(95% CI)

Li et al., 2020a [6]

Dermatomyositis

70

80.1

 

73

51.3

 

0.64

(0.46–0.89)

(BC, Canada)

Polymyositis

79

58.6

 

81

35.4

 

0.60

(0.44–0.82)

D’Silva et al., 2021b [9]

Dermatomyositis

33

71.5

 

33

49.1

 

0.69

(0.42–1.11)

(United Kingdom)

Polymyositis

23

42.1

 

25

34.4

 

0.82

(0.46–1.42)

  1. aPeriods 1 and 2 were 1997–2005 and 2006–2014, respectively
  2. bPeriods 1 and 2 were 1999–2006 and 2007–2014, respectively
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Arthritis Research & Therapy

ISSN: 1478-6362

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