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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

Characteristic Mean year of reporta N Mean difference (se)b Reported – measured Pearson correlation Regression dilution ratio (95 % CI)c
Weight (kg)
 1999 3893 −2.6 (0.10) 0.88 1.00 (0.98–1.01)
 2002 3530 −1.8 (0.09) 0.91 0.99 (0.98–1.00)
 2006 3870 −1.2 (0.07) 0.94 0.99 (0.98–1.00)
 2008 3921 −1.1 (0.05) 0.97 1.02 (1.01–1.02)
 P for trend   <0.001 <0.001 0.07
Height (cm)d
 1999 3951 1.2 (0.05) 0.88 0.85 (0.84–0.87)
 2008 3943 0.8 (0.04) 0.91 0.89 (0.88–0.90)
 P for trend   <0.001 0.003 0.02
BMI (kg/m 2 ) d
 1999 3863 −1.4 (0.04) 0.85 0.98 (0.96–1.00)
 2002 3496 −1.1 (0.04) 0.88 0.96 (0.95–0.98)
 2006 3834 −0.9 (0.03) 0.91 0.97 (0.96–0.99)
 2008 3887 −0.7 (0.02) 0.95 1.01 (1.00–1.02)
 P for trend   <0.001 <0.001 0.30
Waist (cm)e
 2002 1771 −10.3 (0.21) 0.66 0.84 (0.80–0.88)
 2006 1717 −7.2 (0.21) 0.68 0.78 (0.74–0.82)
 2008 2153 −5.2 (0.18) 0.71 0.80 (0.77–0.83)
 P for trend   <0.001 <0.001 0.08
Hips (cm)e
 2002 1774 −2.8 (0.15) 0.75 0.95 (0.91–0.99)
 2006 1724 −2.3 (0.15) 0.76 0.90 (0.87–0.94)
 2008 2165 −2.0 (0.12) 0.82 0.95 (0.92–0.97)
 P for trend   <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: 9 years (reported in 1999), 6 years (reported in 2002), 2 years (reported in 2006) and 4 months (reported in 2008)
  3. b)Difference = 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