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Table 1 Main characteristics of studies included in this meta-analysis

From: Association of anemia with sensorineural hearing loss: a systematic review and meta-analysis

First Author, Publication year Setting Population Study design Sample size Quality score IDAa
Measurea
Hearing loss
Measure
Schieffer 2017 [15] USA Children Cohort 20,113 9 Serum ferritin
Hemoglobin
SNHLc
Schieffer 2017 [17] USA Adults Cohort 305,339 9 Serum ferritin
Hemoglobin
SNHL
Chung 2014 [18] Taiwan Adults CCb 16,016 8 Serum ferritin
Hemoglobin
SNHL
Nash 2011 [16] USA Adults Cohort 2612 9 Hematocrit SNHL
  1. aIron deficiency anemia; bCC = case–control; cSNHL = Sensorineural hearing loss