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Table 2 Summary statistics and correlation coefficients 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

Collection method

p valuea

Correlation coefficient

Self-reported

Measured

ICC (95 % CI)b

All (n = 140)

 Height (cm)

170.3 ± 9.4

170.1 ± 9.1

0.066

0.990 (0.986–0.993)*

 Weight (kg)

71.6 ± 13.9

72.3 ± 14.3

<0.0001

0.993 (0.991–0.995)*

 BMI (kg m−2)

24.6 ± 3.8

24.9 ± 3.9

<0.0001

0.983 (0.977–0.988)*

By sex

 Women (n = 79)

  Height (cm)

164.2 ± 6.4

164.3 ± 6.1

0.084

0.974 (0.960–0.983)*

  Weight (kg)

64.8 ± 10.7

65.5 ± 11.1

0.0004

0.987 (0.981–0.992)*

  BMI (kg m−2)

24.1 ± 3.9

24.3 ± 4.1

0.005

0.982 (0.972–0.988)*

 Men (n = 61)

  Height (cm)

178.1 ± 6.4

177.6 ± 6.3

0.0002

0.985 (0.975–0.981)*

  Weight (kg)

80.4 ± 12.6

81.2 ± 13.0

<0.0001

0.993 (0.988–0.995)*

  BMI (kg m−2)

25.3 ± 3.5

25.7 ± 3.6

<0.0001

0.983 (0.973–0.990)*

By age group

 <45 years (n = 71)

  Height (cm)

171.2 ± 8.9

171.2 ± 8.4

0.136

0.990 (0.985–0.994)*

  Weight (kg)

70.0 ± 13.6

70.5 ± 13.8

0.009

0.992 (0.988–0.996)*

  BMI (kg m−2)

23.7 ± 3.6

23.9 ± 3.7

0.005

0.981 (0.970–0.988)*

 ≥45 years (n = 69)

  Height (cm)

169.3 ± 9.8

169.1 ± 9.7

0.236

0.990 (0.984–0.993)*

  Weight (kg)

73.3 ± 14.1

74.2 ± 14.5

<0.0001

0.994 (0.990–0.996)*

  BMI (kg m−2)

25.4 ± 3.7

25.8 ± 3.9

<0.0001

0.983 (0.973–0.989)*

By BMI categories

 Normal weight (n = 80)

  Height (cm)

169.6 ± 9.0

169.5 ± 8.7

0.719

0.992 (0.987–0.994)*

  Weight (kg)

63.1 ± 8.5

63.4 ± 8.4

0.053

0.984 (0.976–0.990)*

  BMI (kg m−2)

21.9 ± 1.7

22.0 ± 1.7

0.071

0.937 (0.903–0.959)*

 Overweight (n = 43)

  Height (cm)

171.1 ± 9.5

170.6 ± 10.0

0.017

0.987 (0.977–0.993)*

  Weight (kg)

78.8 ± 9.2

79.9 ± 9.3

<0.0001

0.986 (0.975–0.992)*

  BMI (kg m−2)

26.8 ± 1.5

27.40 ± 1.3

<0.0001

0.839 (0.722–0.909)*

 Obese (n = 17)

  Height (cm)

171.8 ± 9.0

171.8 ± 9.0

0.984

0.991 (0.970–0.997)*

  Weight (kg)

93.3 ± 10.4

94.8 ± 10.3

0.002

0.974 (0.934–0.990)*

  BMI (kg m−2)

31.5 ± 1.7

32.1 ± 1.6

0.006

0.864 (0.672–0.948)*

  1. Data represent mean ± SD for self-reported and measured values
  2. * All p values for ICC and Pearson’s correlation were significant at <0.0001
  3. aPaired t test was used for assessing differences between means of both methods
  4. bIntraclass correlation coefficient (ICC)
  5. cPearson’s product correlation coefficient (r) and their corresponding 95 % confident intervals were used to assess the level of reliability between methods