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Table 4 Summary of exposure

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

  N** SMP measured Self reported
   Mean (SD*)*** Mean(SD)
Number of calls 59 2.4(1.3) 1.9(1.1)
Duration of calls 59 3.9(0.9) 4.9(2.2)
   Median(95% CI ‡)***
Number of calls 59 2.3(1.6, 2.5) 2.1(1.7, 2.4)
Duration of calls 59 3.8(3.5, 4.2) 5.2(4.8, 5.7)
  1. ** Number of participants in the study
  2. * Standard deviation
  3. ‡ 95% confidence interval
  4. ***Log transformed data