Table 1.
Overview of included patient cohorts seen by participating study providers
| Year | Unique adult patients seen by providers in the intervention group (n) | Unique adult patients seen by providers in the comparator group (n) | Total Patient Sample | |||
|---|---|---|---|---|---|---|
| Unique patients (n) | Gender | Age (mean ± SD) | ||||
| Male (n,%) | Female (n,%) | |||||
| Calendar year: | ||||||
| 2013 | 18,244 | 12,577 | 67,993 | 26,337 (38%) | 41,656 (62%) | 54 ± 18.2 |
| 2014 | 27,415 | 21,465 | 110,617 | 44,028 (39%) | 66,589 (61%) | 52 ± 18.7 |
| 2015 | 30,844 | 24,906 | 108,240 | 42,312 (39%) | 65,928 (61%) | 53 ± 18.1 |
| Flu season: | ||||||
| 2013–14 | 20,952 | 15,076 | 77,985 | 30,535 (39%) | 47,450 (61%) | 53 ± 18.2 |
| 2014–15 | 24,506 | 17,256 | 82,464 | 31,960 (38%) | 50,504 (62%) | 53 ± 18.1 |
| 2015–16 | 26,226 | 20,356 | 87,931 | 34,024 (38%) | 53,907 (62%) | 54 ± 17.7 |
Calendar year eligibility: A patient is considered to be eligible for the cohort each year if they (1.) are 18 years of age and older as of first day of the year and (2.) they had > = 1 encounter at some point during the year
Flu season eligibility: A patient is considered to be eligible for the cohort each season if they (1.) are 1818 years of age and older as of first day of the flu season and (2.) they had > = 1 encounter at some point during the flu season. In this study a flu season runs from 1-Sep to 31-Mar.