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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