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Table 3 Agreement between SMP (gold standard) and self reported results

From: How well do adolescents recall use of mobile telephones? Results of a validation study

  N Sensitivity (%) Specificity (%) PPV* (%) NPV* (%)
   Overall 59 57 66 63 41
Gender      
   Females 36 58 65 65 42
   Males 23 55 67 60 38
Age      
   < 13 30 53 67 62 41
   ≥ 13 29 60 64 64 40
Language other than English spoken at home      
   No 44 55 68 63 40
   Yes 15 63 57 65 43
  1. *PPV positive predictive value of self reports as percentage
  2. *NPV negative predictive value of self reports as percentage