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