Contact diaries versus wearable proximity sensors in measuring contact patterns at a conference: method comparison and participants’ attitudes

Table 1 Number of contacts stratified by duration as reported in the diaries

	Reported duration: higher value
Reported duration: lower value	<5 min	5-15 min	15-60 min	>60 min	Duration missing	Σ
No report	17 (20)	4 (6)	3 (4)	0 (0)	1 (2)	25 (32)^a
Unknown ID	10 (14)	8 (10)	4 (4)	4 (5)	1 (1)	27 (34)
<5 min	30 (28)	22 (19)	3 (3)	3 (3)	n.d.	58 (53)
5-15 min	n.d.	11 (11)	8 (8)	3 (3)	n.d.	22 (22)
15-60 min	n.d.	n.d.	17 (17)	6 (5)	n.d.	23 (22)
>60 min	n.d.	n.d.	n.d.	22 (22)	n.d.	22 (22)
Duration missing	5 (5)	5 (4)	1 (1)	0 (0)	1 (1)	12 (11)
Σ	62 (67)	50 (50)	36 (37)	38 (38)	3 (4)	189 (196)

For concordant reports that differ in duration, columns contain the higher, rows the lower duration report (i.e., there were 22 pairs of individuals such that one of the pair reported a contact of less than 5 min while the other one reported a contact of 5-15 min); discordant reports and unknown IDs are also shown in rows; bold numbers show data after matching (diary-optimized), numbers in parentheses show crude data; n.d. = not defined.
^aThree contacts to a participant who did not return the diary are excluded from analysis.

ISSN: 1471-2334