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Table 2 Comparisons of self-reported and directly measured weight among 11- to 15 year old adolescents by weighing history, recall ability for weight and response capability for weight

From: Validity of self-reported height and weight among adolescents: the importance of reporting capability

  N Weight/self-reported (kg) Weight/direct (kg) Difference for weight (kg)
   Mean SD Mean SD Mean SD 95% CI P value*
Boys 839 50.98 13.14 51.79 13.29 −0.81 4.95 −1.15; -0.81 <0.0001
Girls 845 47.63 10.07 49.45 10.60 −1.82 3.15 −2.03; -1.61 <0.0001
Weighing history          
Boys          
Weighed recently 572 50.74 13.12 51.64 13.30 −0.90 4.24 −1.24; -0.55 <0.0001
Not weighed recently 259 51.51 13.28 52.17 13.37 −0.67 6.27 −1.43; -0.10 0.0893
Girls          
Weighed recently 645 47.69 10.09 49.26 10.41 −1.57 2.64 −1.77; -1.36 <0.0001
Not weighed recently 195 47.29 10.01 49.99 11.22 −2.70 4.11 −3.28; -2.12 <0.0001
Recall ability for weight          
Boys          
High recall ability 718 50.64 13.33 51.40 13.40 −0.76 4.94 −1.12; -0.40 <0.0001
Low recall ability 112 53.13 11.95 54.34 12.58 −1.21 5.09 −2.17; -0.26 0.0131
Girls          
High recall ability 726 47.54 10.00 49.14 10.38 −1.61 2.83 −1.81; -1.40 <0.0001
Low recall ability 109 48.26 10.65 51.31 11.84 −3.06 4.45 −3.91; -2.21 <0.0001
Response capability for weight          
Boys          
Weighed recently + high recall ability 538 50.61 13.15 51.49 13.36 −0.88 4.25 −1.24; -0.52 <0.0001
Weighed recently + low recall ability 32 53.07 12.83 54.10 12.57 −1.03 4.21 −2.55; 0.49 0.1757
Not weighed recently + high recall ability 179 50.78 13.91 51.16 13.59 −0.39 6.62 −1.36; 0.59 0.4343
Not weighed recently + low recall ability 80 53.15 11.66 54.44 12.66 −1.29 5.43 −2.50; -0.08 0.0373
Girls          
Weighed recently + high recall ability 599 47.79 9.99 49.21 10.20 −1.42 2.39 −1.61; -1.23 <0.0001
Weighed recently + low recall ability 42 46.80 11.62 50.35 13.37 −3.56 4.44 −4.94; -2.17 <0.0001
Not weighed recently + high recall ability 126 46.20 9.93 48.84 11.30 −2.64 3.94 −3.33 ¸-1.94 <0.0001
Not weighed recently + low recall ability 67 49.17 9.98 51.92 10.83 −2.75 4.46 −3.84 ¸-1.66 <0.0001
  1. * Paired T-test.
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BMC Medical Research Methodology

ISSN: 1471-2288

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