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Table 3 Comparisons between measured values in 2008 and earlier self-reported values

From: Validity over time of self-reported anthropometric variables during follow-up of a large cohort of UK women

CharacteristicĀ Mean year of reporta

N

Mean difference (se)b Reported ā€“ measured

Pearson correlation

Regression dilution ratio (95Ā % CI)c

Weight (kg)

ā€ƒ1999

3893

āˆ’2.6 (0.10)

0.88

1.00 (0.98ā€“1.01)

ā€ƒ2002

3530

āˆ’1.8 (0.09)

0.91

0.99 (0.98ā€“1.00)

ā€ƒ2006

3870

āˆ’1.2 (0.07)

0.94

0.99 (0.98ā€“1.00)

ā€ƒ2008

3921

āˆ’1.1 (0.05)

0.97

1.02 (1.01ā€“1.02)

ā€ƒP for trend

Ā 

<0.001

<0.001

0.07

Height (cm)d

ā€ƒ1999

3951

1.2 (0.05)

0.88

0.85 (0.84ā€“0.87)

ā€ƒ2008

3943

0.8 (0.04)

0.91

0.89 (0.88ā€“0.90)

ā€ƒP for trend

Ā 

<0.001

0.003

0.02

BMI (kg/m 2 ) d

ā€ƒ1999

3863

āˆ’1.4 (0.04)

0.85

0.98 (0.96ā€“1.00)

ā€ƒ2002

3496

āˆ’1.1 (0.04)

0.88

0.96 (0.95ā€“0.98)

ā€ƒ2006

3834

āˆ’0.9 (0.03)

0.91

0.97 (0.96ā€“0.99)

ā€ƒ2008

3887

āˆ’0.7 (0.02)

0.95

1.01 (1.00ā€“1.02)

ā€ƒP for trend

Ā 

<0.001

<0.001

0.30

Waist (cm)e

ā€ƒ2002

1771

āˆ’10.3 (0.21)

0.66

0.84 (0.80ā€“0.88)

ā€ƒ2006

1717

āˆ’7.2 (0.21)

0.68

0.78 (0.74ā€“0.82)

ā€ƒ2008

2153

āˆ’5.2 (0.18)

0.71

0.80 (0.77ā€“0.83)

ā€ƒP for trend

Ā 

<0.001

<0.001

0.08

Hips (cm)e

ā€ƒ2002

1774

āˆ’2.8 (0.15)

0.75

0.95 (0.91ā€“0.99)

ā€ƒ2006

1724

āˆ’2.3 (0.15)

0.76

0.90 (0.87ā€“0.94)

ā€ƒ2008

2165

āˆ’2.0 (0.12)

0.82

0.95 (0.92ā€“0.97)

ā€ƒP for trend

Ā 

<0.001

<0.001

0.70

  1. Abbreviations: BMI body mass index, CI confidence interval, RDR regression dilution ratio, se standard error
  2. a)Mean elapsed time between reporting and measurement in 2008: 9Ā years (reported in 1999), 6Ā years (reported in 2002), 2Ā years (reported in 2006) and 4Ā months (reported in 2008)
  3. b)Differenceā€‰=ā€‰reported minus measured in 2008, negative values represent under-reporting and positive values are over-reporting
  4. c)Adjusted for age at measurement and recruitment region
  5. d)Women were not asked for their height in 2002 or 2006. BMI values were calculated using height reported in 1999
  6. e)Women were not asked for waist and hip circumference in 1999