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Table 2 Cross-tabulations, sensitivity and specificity, of measured and self-reported BMI for all respondents, males and females, in SLÁN 2

From: Temporal trends in misclassification patterns of measured and self-report based body mass index categories - findings from three population surveys in Ireland

All Subjects   BMI Groups (Self-report)  
   Normal Overweight Obese Totals
BMI Groups (Measured) Normal 102 (96.2)* 4 (3.8) 0 (0) 106 (32)
Overweight 40 (28.8) 94 (67.6) 5 (3.6) 139 (42)
Obese 0 (0) 31 (36) 55 (64) 86 (26)
Totals 142 129 60 331 (100)
Specificity 82.2 81.8 98  
Males   BMI Groups (Self-report)  
   Normal Overweight Obese Totals
BMI Groups (Measured) Normal 30 (100) 0 (0) 0 (0) 30 (20.4)
Overweight 20 (26.7) 55 (73.3) 0 (0) 75 (51)
Obese 0 (0) 17 (40.5) 25 (59.5) 42 (28.6)
Totals 50 72 25 147 (100)
Specificity 82.9 76.4 100  
Females   BMI Groups (Self-report)  
   Normal Overweight Obese Totals
BMI Groups (Measured) Normal 72 (94.7) 4 (5.3) 0 (0) 76 (41.3)
Overweight 20 (31.2) 39 (60.9) 5 (7.8) 64 (34.8)
Obese 0 (0) 14 (31.8) 30 (68.2) 44 (23.9)
Totals 92 57 35 184 (100)
Specificity 81.5 85 96.4  
  1. *Sensitivity for normal, overweight and obese categories is represented in parenthesis in bold figures.