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Table 1 Participant characteristics

From: Prevalence of iron deficiency among university kendo practitioners in Japan: an observational cohort study

Variables Total (n = 56) Male (n = 39) Female (n = 17)
Participant Characteristics
 Age (years) 20 [20, 22] 20 [20, 22] 20 [19, 21]
 Years of sports/athletics 15 [13, 17] 15 [13, 17] 15 [13, 17]
 Body mass index (kg/m2) 24.4 [23.3, 26.5] 24.7 [23.5, 26.6] 23.8 [22.3, 26.9]
 Body fat percentage 18.3 [14.8, 23.9] 16.3 [13.5, 18.4] 26.6 [23.8, 29.1]
 Previous history of anemia 4 (8) 1 (3) 3 (19)
 Previous use of iron supplements 11 (21) 6 (16) 5 (31)
Anemia status
 Prevalence of anemia 0 (0) 0 (0) 0 (0)
 Erythrocyte count (×  104/μL) 496 [469, 554] 505 [487, 541] 444 [425, 473]
 Hemoglobin (g/dL) 14.8 [14.0, 15.8] 15.1 [14.7, 16.1] 13.4 [12.7, 14.9]
 Hematocrit (%) 45.7 [43.6, 48.0] 46.8 [44.8, 48.4] 41.7 [39.9, 44.5]
 MCV (fL) 93 [90, 94] 92 [90, 94] 94 [92, 96]
 MCH (pg) 30.1 [29.4, 30.6] 30.1 [29.4, 30.4] 30.2 [29.7, 30.8]
 MCHC (g/dL) 32.6 [31.9, 33.1] 32.8 [32.4, 33.3] 31.9 [31.6, 32.5]
Iron metabolism
 Ferritin (ng/mL) 91 [49, 130] 108 [80, 144] 43 [25, 58]
   > 100 and ≤ 300 ng/mL 25 (45) 24 (62) 1 (6)
   > 50 and ≤ 100 ng/mL 16 (29) 11 (28) 5 (29)
   > 30 and ≤ 50 ng/mL 8 (14) 4 (10) 4 (24)
   > 15 and ≤ 30 ng/mL 5 (9) 0 (0) 5 (29)
   ≤ 15 2 (4) 0 (0) 2 (12)
Serum iron (μg/dL) 90 [65, 142] 91 [62, 144] 83 [72, 113]
TIBC (μg/dL) 333 [319, 355] 330 [319, 349] 347 [326, 386]
Transferrin saturation (%) 26.8 [18.8, 40.1] 27.8 [18.3, 45.5] 24.6 [20.5, 33.3]
  1. Data are shown as median [lower and upper interquartile range] or number (percentage). *p < 0.05, p < 0.01, and p < 0.001 for the comparison between male and female practitioners. Abbreviations: MCV: mean corpuscular volume; MCH: mean corpuscular hemoglobin; MCHC: mean corpuscular hemoglobin concentration; TIBC: total iron-binding capacity