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Table 4 Comparisons of z-scores based on self-reported and direct measures of weight and height among 11- to 15 year old adolescents by response

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

  N z-score/self-reported z-score/direct Difference for z-score
   Mean SD Mean SD Mean SD 95% CI P value*
Boys 791 −0.22 1.03 −0.08 1.01 −0.14 0.70 −0.19;- 0.09 <0.0001
Girls 815 −0.40 0.94 −0.12 0.95 −0.28 0.53 −0.31; -0.24 <0.0001
BMI Response capability**          
Boys          
High 419 −0.28 1.00 −0.11 0.99 −0.18 0.62 −0.24; -0.12 <0.0001
Low 360 −0.16 1.06 −0.04 1.06 −0.12 0.80 −0.20; -0.04 0.0053
Girls          
High 458 −0.40 0.95 −0.17 0.93 −0.23 0.45 −0.27; -0.19 <0.0001
Low 343 −0.39 0.93 −0.05 0.97 −0.34 0.61 −0.41; -0.28 <0.0001
  1. * Paired T-test.
  2. **High combined response capability = measured recently + high recall ability for height + weighed recently + high recall ability for weight, Low combined response capability = remaining categories.