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Table 3 Bland–Altman analyses for self-reported and measured height, weight and BMI

From: How reliable is internet-based self-reported identity, socio-demographic and obesity measures in European adults?

Variables

Bland–Altman

p value*

Absolute mean differences (LOA)

Relative mean differences (LOA, %)

All (n = 140)

 Height (cm)

0.19 (−2.3 to 2.7)

0.11 (−1.4 to 1.6)

0.066

 Weight (kg)

−0.70 (−3.6 to 2.1)

−0.93 (−4.9 to 3.1)

<0.0001

 BMI (kg m−2)

−0.29 (−1.5 to 1.0)

−1.14 (−6.2 to 4.0)

<0.0001

By sex

 Women (n = 79)

  Height (cm)

0.03 (−2.8 to 2.7)

0.02 (−1.7 to 1.7)

0.084

  Weight (kg)

−0.65 (−3.7 to 2.4)

−0.94 (−5.6 to 3.7)

0.0004

  BMI (kg m−2)

−0.23 (−1.6 to 1.2)

−0.89 (−6.7 to 4.9)

0.005

 Men (n = 61)

  Height (cm)

0.49 (−1.4 to 2.4)

0.28 (−0.8 to 1.4)

0.0002

  Weight (kg)

−0.81 (−3.3 to 1.8)

−0.90 (−3.9 to 2.1)

<0.0001

  BMI (kg m−2)

−0.38 (−1.4 to 0.6)

−1.45 (−5.3 to 2.4)

<0.0001

By age group

 <45 years (n = 71)

  Height (cm)

0.21 (−2.1 to 2.5)

0.11 (−1.3 to 1.5)

0.136

  Weight (kg)

−0.50 (−3.6 to 2.6)

−0.69 (−5.3 to 3.9)

0.009

  BMI (kg m−2)

−0.23 (−1.5 to 1.1)

−0.91 (−6.6 to 4.8)

0.005

 >45 years (n = 69)

  Height (cm)

0.18 (−2.1 to 2.5)

0.10 (−1.5 to 1.7)

0.236

  Weight (kg)

−0.91 (−3.5 to 1.6)

−1.16 (−4.4 to 2.0)

<0.0001

  BMI (kg m−2)

−0.37 (−1.5 to 0.8)

−1.37 (−5.7 to 3.0)

<0.0001

By BMI categories

 Normal weight (n = 80)

  Height (cm)

0.04 (−2.1 to 2.2)

0.02 (−1.3 to 1.3)

0.719

  Weight (kg)

−0.32 (−3.1 to 2.5)

−0.52 (−5.0 to 4.0)

0.053

  BMI (kg m−2)

−0.12 (−1.3 to 1.0)

−0.56 (−5.9 to 4.7)

0.071

 Overweight (n = 43)

  Height (cm)

0.56 (−2.4 to 3.5)

0.32 (−1.5 to 2.1)

0.017

  Weight (kg)

−1.08 (−3.2 to 1.0)

−1.37 (−3.9 to 1.2)

<0.0001

  BMI (kg m−2)

−0.54 (−1.7 to 0.7)

−2.01 (−6.4 to 2.4)

<0.0001

 Obese (n = 17)

  Height (cm)

0.01 (−2.4 to 3.2)

0.01 (−1.4 to 1.4)

0.984

  Weight (kg)

−1.56 (−3.8 to 1.4)

−1.70 (−5.6 to 2.2)

0.002

  BMI (kg m−2)

−0.53 (−1.8 to 0.7)

−1.68 (−6.1 to 2.8)

0.006

  1. Data represent absolute and relative mean differences (SR—measured values) with their corresponding limits of agreements (LOA ± 1.96 SD)
  2. * Paired t test was used for assessing absolute differences between means of SR and measured values