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Table 1 Cross-tabulations, sensitivity and specificity, of measured and self-reported BMI for all respondents, males and females, in SLÁN 1998

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 78 (94)* 5 (6) 2 (2.2) 83 (39.9)
Overweight 20 (24.7) 61 (75.3) 9 (8.7) 81 (38.9)
Obese 0 (0) 9 (20.5) 35 (79.5) 44 (21.2)
Totals 98 75 35 208 (100)
Specificity 84 89 100  
Males   BMI Groups (Self-report)  
   Normal Overweight Obese Totals
BMI Groups (Measured) Normal 18 (94.7) 1 (5.3) 0 (0) 19 (28.8)
Overweight 9 (28.1) 23 (71.9) 0 (0) 32 (48.5)
Obese 0 (0) 3 (20) 12 (80) 15 (22.7)
Totals 27 27 12 66 (100)
Specificity 80.9 88.2 100  
Females   BMI Groups (Self-report)  
   Normal Overweight Obese Totals
BMI Groups (Measured) Normal 60 (93.8) 4 (6.2) 0 (0) 64 (45.1)
Overweight 21 (22.4) 38 (77.6) 0 (0) 49 (34.5)
Obese 0 (0) 6 (20.7) 23 (79.3) 29 (20.4)
Totals 71 48 23 142 (100)
Specificity 85.9 89.2 100  
  1. *Sensitivity for normal, overweight and obese categories is represented in parenthesis in bold figures.