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Table 2 Measured impedance data and statistics for the included groups

From: An evaluation of phase angle, bioelectrical impedance vector analysis and impedance ratio for the assessment of disease status in children with nephrotic syndrome

Parameter

ANS

ANS*

NSR

HC

ANS* vs. NSR

(paired)

ANS vs. HC

(unpaired)

NSR vs. HC

(unpaired)

Raw impedance data

 fc (Hz)

144.5 ± 43.1

155.8 ± 44.5

96.8 ± 43.9

93.2 ± 29.2

p < 0.01

p < 0.05

p > 0.05

 R50 (Ω)

421.5 ± 44.7

399.3 ± 41.0

663.1 ± 61.5

721.9 ± 65.3

p < 0.001

p < 0.001

p > 0.05

 Rfc (Ω)

403.4 ± 40.9

382.1 ± 37.4

639.8 ± 58.2

694.7 ± 62.7

p < 0.001

p < 0.001

p > 0.05

 XC50 (Ω)

22.1 ± 5.4

18.6 ± 3.4

63.0 ± 11.9

66.9 ± 8.1

p < 0.01

p < 0.001

p > 0.05

 XCfc (Ω)

24.2 ± 5.7

21.2 ± 5.2

72.4 ± 11.2

73.8 ± 10.1

p < 0.001

p < 0.001

p > 0.05

 Z5 (Ω)

442.1 ± 47.9

416.2 ± 42.8

733.9 ± 65.1

794.9 ± 71.6

p < 0.001

p < 0.001

p > 0.05

 Z200 (Ω)

396.8 ± 41.2

378.0 ± 39.4

603.7 ± 59.6

656.8 ± 59.9

p < 0.001

p < 0.001

p > 0.05

 Zfc (Ω)

404.3 ± 41.1

382.8 ± 37.5

643.1 ± 58.4

698.6 ± 63.0

p < 0.001

p < 0.001

p > 0.05

PA (degrees)

 PA50

3.0 ± 0.6

2.7 ± 0.4

5.5 ± 1.1

5.3 ± 0.5

p < 0.01

p < 0.001

p > 0.05

 PAfc

3.4 ± 0.6

3.1 ± 0.5

6.5 ± 1.0

6.1 ± 0.6

p < 0.01

p < 0.001

p > 0.05

BIVA RXc (Ω/m)

 R50/H

356.9 ± 87.6

337.2 ± 91.8

555.8 ± 166.9

579.4 ± 94.9

p < 0.01

p < 0.001

p > 0.05

 Rfc/H

341.1 ± 81.0

322.4 ± 85.6

530.6 ± 142.3

556.5 ± 83.4

p < 0.01

p < 0.001

p > 0.05

 XC50/H

18.4 ± 4.9

15.4 ± 3.4

50.6 ± 7.6

58.8 ± 9.5

p < 0.001

p < 0.001

p > 0.05

 XCfc/H

20.5 ± 6.6

17.9 ± 6.9

58.7 ± 10.8

58.7 ± 10.8

p < 0.001

p < 0.001

p > 0.05

BIVA Zs (no unit)

 ZS(R50/H)

−2.3 ± 0.9

−2.6 ± 1.0

−0.3 ± 1.7

0.0 ± 1.0

p < 0.01

p < 0.001

p > 0.05

 ZS(Rfc/H)

−2.6 ± 1.0

−2.8 ± 1.0

−0.3 ± 1.7

0.0 ± 1.0

p < 0.01

p < 0.001

p > 0.05

 ZS(XC50/H)

− 4.5 ± 0.6

−4.9 ± 0.4

−0.4 ± 1.0

0.0 ± 1.0

p < 0.001

p < 0.001

p > 0.05

 ZS(XCfc/H)

−4.0 ± 0.7

−4.3 ± 0.7

0.0 ± 1.1

0.0 ± 1.0

p < 0.001

p < 0.001

p > 0.05

IR (no unit)

 IR200/5

0.90 ± 0.02

0.91 ± 0.01

0.82 ± 0.03

0.83 ± 0.02

p < 0.01

p < 0.0001

p > 0.05

 IRfc/5

0.92 ± 0.01

0.92 ± 0.01

0.88 ± 0.01

0.88 ± 0.01

p < 0.001

p < 0.001

p > 0.05

  1. Data are means ± SD. For group and impedance descriptions, see Table 1. H: height, Z: impedance (Z2 = R2 + XC2), ZS = Z score
  2. For group and impedance descriptions, see Table 1; ZS = Z score; A Student’s t-test was used to determine differences between the groups with statistical significance set at a p-value < 0.05
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BMC Nephrology

ISSN: 1471-2369

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