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Table 3 Comparisons between quantitative MWS and corresponding NSHD variables

From: Lifetime body size and reproductive factors: comparisons of data recorded prospectively with self reports in middle age

     Difference Scaled 95% limits Intraclass Pearson
   MWS NSHD (MWS - NSHD) of agreement correlation correlation
Variable (units) N mean (SD) mean (SD) mean (SD) P * lower to upper† ICC (SE) ‡ r (SE)
Self-reported at recruitment in the MWS        
   Height (cm) 449 162.8 (6.3) 162.0 (5.7) 0.9 (2.7) <0.001 -0.8 to 1.1 0.89 (0.01) 0.91 (0.01)
   Weight (kg) 443 68.8 (13.1) 71.0 (14.1) -2.2 (4.2) <0.001 -0.7 to 0.4 0.94 (0.006) 0.95 (0.004)
   Body mass index (kg/m2) 437 25.9 (4.7) 27.0 (5.2) -1.1 (2.0) <0.001 -1.0 to 0.5 0.90 (0.01) 0.92 (0.01)
   Age at menarche (yr) 394 13.0 (1.4) 12.9 (1.0) 0.1 (1.2) 0.093 -2.1 to 2.3 0.54 (0.04) 0.57 (0.03)
   Age at menopause (yr) 134 48.0 (4.5) 48.2 (4.2) -0.3 (1.8) 0.091 -0.9 to 0.8 0.92 (0.01) 0.92 (0.01)
Self-reported at resurvey in the MWS        
   Birth weight (kg) 234 3.2 (0.7) 3.3 (0.5) -0.1 (0.4) <0.001 -1.8 to 1.4 0.75 (0.03) 0.78 (0.03)
   Mother's height (cm) 294 160.4 (7.1) 161.4 (6.5) -0.9 (5.2) 0.002 -1.7 to 1.4 0.70 (0.03) 0.71 (0.03)
   Father's height (cm) 240 174.1 (7.6) 173.7 (7.9) 0.3 (6.3) 0.451 -1.5 to 1.6 0.67 (0.04) 0.67 (0.04)
   Waist circumference (cm) 206 76.0 (9.3) 82.0 (10.6) -6.0 (7.2) <0.001 -1.9 to 0.8 0.59 (0.05) 0.74 (0.03)
   Hip circumference (cm) 204 100.0 (8.3) 103.1 (8.5) -3.2 (5.3) <0.001 -1.6 to 0.9 0.74 (0.03) 0.80 (0.03)
   Waist-to-hip ratio 197 0.76 (0.06) 0.79 (0.06) -0.03 (0.06) <0.001 -2.4 to 1.3 0.41 (0.06) 0.52 (0.05)
   Waist-to-height ratio 204 0.47 (0.06) 0.51 (0.07) -0.04 (0.04) <0.001 -1.9 to 0.7 0.60 (0.05) 0.75 (0.03)
  1. MWS: Million Women Study. NSHD: National Survey of Health and Development. N: numbers of women with non-missing values for both MWS and NSHD variables. r: Pearson correlation. SE: standard error.
  2. * P-value for t-test of mean difference = 0.
  3. † Lower to upper Bland-Altman limits of agreement divided by the SD of the NSHD data.
  4. ‡ ICC(1,1) in the notation of Shrout and Fleiss [26].