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Table 1 Studies reporting anaemia in older persons using WHO criteria

From: Prevalence of anaemia in older persons: systematic review

  Number of Percent of total
Size range (individuals) Studies Patients Studies Patients
10,000–20,000 2 30,331 5.9 35.5
5,000–10,000 3 21,590 8.8 25.3
2,500–5,000 3 12,373 8.8 14.5
1,000–2,500 10 14,867 29.4 17.4
100–1,000 16 6,248 47.1 7.3