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Table 2 Descriptive statistics of operator-derived mobile phone data that were received for 346 study subjects for all three years 2007-2009.

From: Validation of exposure assessment and assessment of recruitment methods for a prospective cohort study of mobile phone users (COSMOS) in Finland: a pilot study

Year 2007 2008 2009
Call time (minutes per month)    
   mean 298 316 342
   median 186 220 221
Number of calls (per month)    
   mean 70 77 80
   median 52 54 57