Table 1.

Data set structure of call detail records before and after preprocessing.

Participant characteristics		Before preprocessing (N=26)	After preprocessing (N=21)
Number of participants, n (%)
	Female	20 (77)		16 (76)
	Male	6 (23)		5 (24)
Age (years)
	Range	71-91		71-91
	Mean (SD)	84 (4)		83 (4)
Number of calls, n
	Total outgoing calls	19,198		18,338
	Calls by individual, 1st quartile	285		481
	Calls by individual, median	590		710
	Calls by individual, 3rd quartile	944		1096