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Table 1 Characteristics of included studies on influenza vaccine effectiveness in patients with end-stage renal disease

From: Influenza vaccination in patients with end-stage renal disease: systematic review and assessment of quality of evidence related to vaccine efficacy, effectiveness, and safety

Author, country [Ref]

Study design, year

Age in years

Male patients (%)

Years on dialysis

Patients on hemodialysis (%)

Diagnosis of renal disease, identification of patients

Predominantly circulating influenza strains

Study size

(mean ± SD or range)

(mean ± SD or range)

Bond et al., US [25]

Cohort, 2005–2006

vacc.: 60.6 ± 15.2

vacc.: 50.8

vacc.: 4.5 ± 3 .6

vacc.: 92.6

USRDS; ICD-9-CM codes

Not reported

vacc.: n = 14,226

unvacc.: 57.9 ± 15.9

unvacc.: 52.5

unvacc.: 4.8 ± 4.1

unvacc.: 90.4

unvacc.: n = 5,994

Gilbertson et al., US [24]1

Cohort, 1997–1999

vacc.: 40–64: 36.3%; 65+: 53.8%

vacc.: 40.3

Proportion > 4 yrs on dialysis:

01

USRDS; ICD-9-CM codes1

Not reported

Patients on peritoneal dialysis: n = 13,091

unvacc.: 40–64: 64.7%; 65+: 46.2%

unvacc.: 59.7

vacc: 35.9%

unvacc.: 37.7%

McGrath et al., US [26]

Cohort, 1997–1999, 2001

vacc.: 62.3–63.92

vacc.: 52.2-53.02

Proportion > 4 yrs on dialysis:

100

USRDS; ICD-9-CM codes

H3N2 (all seasons)

vacc.: n = 52,287–61,8002

unvacc.: 60.3–61.72

unvacc.: 50.4-51.62

vacc.: 29.2-30.9%2

unvacc.: n = 55,178–64,8992

unvacc.: 32.5-34.1%2

Slinin et al., US [27]

Cohort, 1993–1994

all: 60.3

all: 51.1

Proportion < 5 yrs on dialysis:

100

USRDS; ICD-9-CM codes

Not reported

all: n = 10,635

all: 75.8%

Wang et al., Taiwan [23]

Cohort, 1998–2009

vacc.: 70.2 ± 9.96

vacc.: 50.3

Patients with “newly diagnosed” ESRD

100

Universal insurance data, National Health Insurance program

Not reported

vacc.: n = 831 unvacc.: n = 3,187

unvacc.: 59.4 ± 14.5

unvacc.: 48.7

Total study population

      

Total: n = 174,6633

  1. ESRD, end-stage renal disease; vacc., vaccinated; unvacc., non-vaccinated.
  2. 1Since Gilbertson et al. and McGrath et al. used the same database, but McGrath included patients on hemodialysis only, patients on peritoneal dialysis were extracted from the study of Gilbertson et al.
  3. 2Range over 4 seasons.
  4. 3Since all US studies used the same database, overlapping of the populations cannot be ruled out.