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Table 1 Demographics, anthropometrics, athletic performance scores, dietary intakes and biomarkers of iron status

From: Sex-specific relationships among iron status biomarkers, athletic performance, maturity, and dietary intakes in pre-adolescent and adolescent athletes

 

Composite (n = 249)

Males (n = 179)

Females (n = 70)

Outliers (n = 16)

Age (y)

12.0 ± 2.1 (n = 249)

12.0 ± 2.1 (n = 179)

12.0 ± 2.2 (n = 70)

 

Maturity Offset (y)

−1.3 ± 1.9 (n = 249)

−1.7 ± 1.7 (n = 179)*

−0.1 ± 1.8 (n = 70)

 

Height (cm)

155.2 ± 13.6 (n = 249)

156.3 ± 13.9 (n = 179)*

152.4 ± 12.3 (n = 70)

 

Weight (kg)

48.0 ± 16.0 (n = 249)

49.1 ± 16.5 (n = 179)

45.3 ± 14.5 (n = 70)

120.6 kg

Body Fat (%)

20.2 ± 6.5 (n = 244)

19.7 ± 6.7 (n = 175)

21.5 ± 5.9 (n = 69)

47.9%

Arm eCSA (cm2)

14.3 ± 6.9 (n = 246)

15.6 ± 7.3 (n = 176)*

11.2 ± 4.6 (n = 70)

45.74 cm2

Thigh eCSA (cm2)

80.6 ± 31.5 (n = 245)

83.3 ± 33.0 (n = 175)*

73.7 ± 26.3 (n = 70)

 

Vertical Jump (cm)

40.2 ± 9.4 (n = 246)

41.7 ± 9.6 (n = 177)*

36.4 ± 7.4 (n = 69)

 

Broad Jump (cm)

168.6 ± 30.2 (n = 247)

172.9 ± 30.6 (n = 178)*

157.3 ± 26.2 (n = 69)

 

Pro-Agility (s)

5.8 ± 0.6 (n = 247)

5.7 ± 0.6 (n = 177)*

5.9 ± 0.5 (n = 70)

8.76 s

L Cone (s)

9.4 ± 0.9 (n = 245)

9.3 ± 1.0 (n = 176)*

9.7 ± 0.8 (n = 69)

15.0 s

20 Yard Dash (s)

3.7 ± 0.5 (n = 248)

3.7 ± 0.5 (n = 178)a

3.8 ± 0.4 (n = 70)

5.98, 6.79 s

Power Push Up (N)

170.6 ± 84.1 (n = 246)

185.5 ± 90.0 (n = 177)*

132.6 ± 51.3 (n = 69)

583, 601 N

Energy Intake (kcals·d− 1)

2052 ± 711 (n = 97)

2158 ± 749 (n = 66)*

1827 ± 568 (n = 31)

 

Carbohydrates (g·d− 1)

244 ± 89 (n = 97)

256 ± 89 (n = 66)*

217 ± 83 (n = 31)

 

Protein (g·d− 1)

90 ± 38 (n = 97)

98 ± 41 (n = 66)*

74 ± 25 (n = 31)

 

Fat (g·d−1)

82 ± 37 (n = 97)

84 ± 39 (n = 66)

76 ± 34 (n = 31)

 

Iron (mg·d− 1)

16.5 ± 9.7 (n = 97)

17.9 ± 10.9 (n = 66)*b

13.5 ± 5.5 (n = 31)

46.0, 44.8, 55.0, 62.0 mg·d− 1

Hemoglobin (g·L− 1)

113 ± 16 (n = 128)

114 ± 16 (n = 100)

112 ± 19 (n = 28)

 

Ferritin (μg·L− 1)

24.0 ± 15.0 (n = 118)

25.3 ± 16.2 (n = 94)*

18.6 ± 7.3 (n = 24)

 

sTfR (nmol·L− 1)

22.1 ± 6.4 (n = 105)

21.9 ± 6.8 (n = 76)

22.8 ± 5.5 (n = 29)

38.8, 44.5, 66.7 nmol·L− 1

  1. Values are means ± standard deviations (SD)
  2. *Indicates a significant difference between the mean values of males versus females (p ≤ 0.05) with outliers included
  3. aIndicates a significant difference after removal of outliers. bIndicates difference became non-significant after removal of outliers