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Table 2 Characterization of the investigative activities taken regarding syndromic alerts, serving as a process evaluation measure

From: Evaluation of the ability of standardized supports to improve public health response to syndromic surveillance for respiratory diseases in Canada

  Total (n, alerts) Intervention group (n, alerts) Control group (n, alerts)
Alerts received by local public health agency study participants 1969 942 1027
 Year 1 801 409 392
 Year 2 1168 533 635
Alerts checked for data misclassification, data stream issues, or error-related issues 305 (15%) 224 (24%) 81 (8%)
 Year 1 193 (24%) 156 (38%) 37 (9%)
 Year 2 112 (10%) 68 (13%) 44 (7%)
Alerts checked for epidemiological clustering 1538 (78%) 664 (70%) 874 (85%)
 Year 1 635 (79%) 253 (62%) 382 (97%)
 Year 2 903 (77%) 411 (77%) 492 (77%)
Alerts warranting public health action 714 (36%) 165 (18%) 549 (53%)
 Year 1 319 (40%) 11 (3%) 308 (79%)
 Year 2 395 (34%) 154 (29%) 241 (38%)
 Missing 380 (19%) 168 (18%) 212 (21%)