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Table 3 Cross-tabulations, sensitivity and specificity, of measured and self-reported BMI for all respondents, males and females, in SLÁN 2007

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 692 (94.3)* 41 (5.6) 1 (0.1) 734 (36)
Overweight 248 (30.8) 531 (66) 26 (3.2) 805 (39.5)
Obese 20 (4) 212 (42.6) 266 (53.4) 498 (24.4)
Totals 960 784 293 2037 (100)
Specificity 79.4 79.5 98.2  
Males   BMI Groups (Self-report)  
   Normal Overweight Obese Totals
BMI Groups (Measured) Normal 242 (92.4) 20 (7.6) 0 (0) 262 (28.8)
Overweight 101 (24.4) 296 (71.5) 17 (4.1) 414 (45.5)
Obese 5 (2.1) 101 (43.3) 127 (54.5) 233 (25.6)
Totals 348 417 144 909 (100)
Specificity 83.6 75.6 97.5  
Females   BMI Groups (Self-report)  
   Normal Overweight Obese Totals
BMI Groups (Measured) Normal 450 (95.3) 21 (4.4) 1 (0.2) 472 (41.8)
Overweight 147 (37.6) 235 (60.1) 9 (2.3) 391 (34.7)
Obese 15 (5.7) 111 (41.9) 139 (52.5) 265 (23.5)
Totals 612 367 149 1128 (100)
Specificity 75.3 82.1 98.8  
  1. *Sensitivity for normal, overweight and obese categories is represented in parenthesis in bold figures.
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