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Table 2 Misreporting of the mean self-reported BMI by strata, FCS 2014

From: Correction of self-reported BMI based on objective measurements: a Belgian experience

Region Gender Education Age group Mean measured BMI Mean self-reported BMI Abs. diff. a Rel. diff.b
Total Total Total Total 26.17 (25.79–26.55) 25.20 (24.85–25.56) 0.96 (0.87–1.06) 1.038 (1.034–1.042)
Flemish Region Males Low level 18–34 24.41 (22.96–25.85) 24.21 (22.75–25.66) 0.20 (− 0.08–0.48) 1.009 (0.996–1.022)
   35–50 27.41 (25.63–29.18) 26.40 (24.85–27.96) 1.00 (0.26–0.48) 1.038 (1.018–1.057)
   51–64 28.82 (27.68–29.96) 27.94 (26.85–29.03) 0.88 (0.43–1.33) 1.032 (1.017–1.048)
  High level 18–34 23.79 (23.08–24.50) 23.07 (22.41–23.72) 0.73 (0.44–1.01) 1.031 (0.019–1.044)
   35–50 26.28 (25.30–27.27) 25.60 (24.69–26.52) 0.68 (0.49–0.88) 1.027 (1.019–1.034)
   51–64 26.20 (25.15–27.25) 25.35 (24.33–26.37) 0.85 (0.50–1.21) 1.034 (1.019–1.049)
Females Low level 18–34 26.02 (23.79–28.25) 24.60 (22.88–26.32) 1.42 (0.50–2.33) 1.056 (1.024–1.088)
   35–50 26.58 (24.33–28.84) 25.26 (22.99–27.52) 1.33 (0.76–1.90) 1.056 (1.034–1.079)
   51–64 28.51 (25.92–31.10) 27.00 (24.52–29.48) 1.51 (1.10–1.92) 1.057 (1.041–1.073)
  High level 18–34 22.87 (21.98–23.76) 22.10 (21.29–22.91) 0.77 (0.37–1.17) 1.034 (1.017–1.052)
   35–50 24.91 (23.84–25.97) 23.98 (23.02–24.94) 0.92 (0.63–1.22) 1.038 (1.026–1.050)
   51–64 25.67 (23.96–27.39) 24.51 (23.06–25.95) 1.16 (0.73–1.60) 1.045 (1.030–1.060)
Brussels Region Males Low level 18–34 25.60 (21.21–29.99) 24.93 (21.65–28.20) 0.67 (− 1.22–2.57) 1.025 (0.952–1.098)
   35–50 25.04 (20.39–29.68) 24.16 (11.40–36.92) 0.88 (− 7.24–8.99) 1.038 (0.691–1.384)
   51–64 25.03 (19.38–30.68) 25.19 (20.53–29.85) −0.16 (− 1.30–0.97) 0.992 (0.948–1.036)
  High level 18–34 24.30 (22.03–26.57) 22.96 (21.78–24.15) 1.34 (− 0.31–2.98) 1.057 (0.986–1.128)
   35–50 25.39 (24.05–26.54) 24.62 (23.82–25.42) 0.67 (−0.22–1.57) 1.028 (0.993–1.063)
   51–64 23.99 (19.25–28.74) 24.19 (20.48–27.91) −0.20 (− 1.75–1.35) 0.987 (0.913–1.061)
Females Low level 18–34 25.67 (18.97–32.37) 24.98 (17.75–32.21) 0.69 (− 0.20–1.58) 1.033 (0.987–1.079)
   35–50 33.54 (6.95–60.14) 32.17 (6.71–57.63) 1.38 (−0.58–3.34) 1.043 (0.976–1.110)
   51–64 27.35 (17.42–37.28) 25.60 (17.73–33.46) 1.75 (− 1.02–4.53) 1.062 (0.978–1.147)
  High level 18–34 22.87 (18.24–27.51) 22.03 (18.36–25.70) 0.85 (−0.23–1.92) 1.033 (1.000–1.066)
   35–50 25.64 (20.44–30.84) 24.13 (19.77–28.48) 1.51 (0.40–2.62) 1.056 (1.019–1.092)
   51–64 25.66 (19.95–31.36) 24.63 (19.23–30.04) 1.02 (−0.24–2.29) 1.041 (0.987–1.094)
Walloon Region Males Low level 18–34 24.93 (23.71–26.16) 24.37 (23.31–25.43) 0.56 (0.16–0.96) 1.022 (1.007–1.038)
   35–50 28.73 (26.21–31.25) 27.44 (24.78–30.11) 1.28 (0.83–1.73) 1.051 (1.029–1.072)
   51–64 28.02 (26.80–29.25) 26.89 (25.80–27.98) 1.14 (0.62–1.65) 1.043 (1.023–1.062)
  High level 18–34 25.28 (23.37–27.19) 24.69 (22.84–26.53) 0.59 (0.32–0.86) 1.022 (1.012–1.033)
   35–50 28.49 (25.85–31.12) 27.70 (25.14–30.26) 0.79 (0.55–1.02) 1.029 (1.020–1.037)
   51–64 29.85 (27.21–32.49) 28.33 (25.95–30.70) 1.52 (0.84–2.20) 1.053 (1.033–1.073)
Females Low level 18–34 25.00 (22.40–27.60) 24.19 (21.74–26.63) 0.81 (0.31–1.32) 1.034 (1.012–1.056)
   35–50 27.62 (25.37–29.88) 26.30 (24.02–28.58) 1.32 (0.52–2.12) 1.051 (1.022–1.081)
   51–64 27.50 (25.97–29.03) 26.18 (24.58–27.78) 1.32 (0.62–2.02) 1.053 (1.020–1.085)
  High level 18–34 24.59 (21.06–28.13) 23.60 (20.14–27.06) 0.99 (0.34–1.65) 1.040 (1.017–1.063)
   35–50 25.49 (23.30–27.67) 24.25 (22.26–26.25) 1.23 (0.81–1.65) 1.050 (1.034–1.066)
   51–64 27.71 (25.65–29.77) 26.61 (24.38–28.83) 1.10 (0.63–1.58) 1.043 (1.025–1.061)
  1. aAbsolute difference: mean measured BMI – mean self-reported BMI
  2. bRelative difference: mean measured BMI / mean self-reported BMI