The Effect of Proximity on Flu-Shot Participation
The Effect of Proximity on Flu-Shot Participation
Using desk location information and employees' building entry/exit swipe card data from a
 company that offered a free 2-day worksite influenza vaccination clinic, we separately
 identify the vaccination effects of base proximity-the inverse of walking distance between
 one's desk and the clinic-and functional proximity-the likelihood of passing near the clinic
 during the course of a normal work day (ie, days when the clinic is not open).
We study the 2011 influenza vaccine uptake of employees at the headquarters of a health
 benefits administrator in the United States. These employees are generally not health care
 personnel. All of them have health insurance. Of the company's total workforce (including
 those not based at the headquarters), 26% are African Americans and 37% are racial
 minorities.

 There are 2 main buildings at the company headquarters. Building One houses 520 employees and
 is the site of the vaccination clinic; Building Two houses 1281 employees. The 2 buildings
 are 131 meters apart and connected by an enclosed passageway. The clinic was located near the
 cafeteria in Building One and adjacent to the passageway connecting the 2 buildings. The
 clinic was conducted from October 19 to 20, 2011, and it was advertised during the 3 weeks
 prior.

 The company requires employees to swipe a personalized electronic badge to open the external
 doors of its buildings, which include the doors to the passageway between the buildings. The
 company provided us data on the date and time of each swipe in September and October 2011. If
 an employee swipes her badge and holds the door open for another employee, we do not observe
 that other employee. The badge swipe data are therefore an incomplete measure of all
 movements between the buildings. The company also gave us data on employee characteristics
 and vaccination uptake, scaled architectural plans of the buildings, and employee desk maps.
Inclusion Criteria:

 -  Employee of Express Scripts.

 -  Eligible to receive a flu shot at Express Scripts.

 -  Over 18 years of age.

 Exclusion Criteria:

 -  Children

 -  Non Express Scripts employees