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OpenTrials
Completed

NCT Number: NCT01455753

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).

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Key information

Conditions

Influenza Human Infections Influenza, Human Orthomyxoviridae Infections RNA Virus Infections Respiratory Tract Diseases Respiratory Tract Infections Virus Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Observational

Primary location

Express Scripts

St Louis, Missouri, 63121, United States

About this study

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.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

Functional Proximity

Other

Using each employee's building entry/exit swipe card data, we test whether functional proximity-the likelihood that the employee walks by the clinic for reasons other than vaccination-predicts whether the employee gets vaccinated at the clinic.

Base Proximity

Other

We also test whether base proximity-the inverse of walking distance from the employee's desk to the clinic-predicts vaccination probability.

Primary outcomes

  1. Receipt of influenza vaccine

    Time frame: One week

    The investigators will measure whether proximity to a flu shot clinic effected whether an employee received an influenza vaccine.

Secondary outcomes

  1. Absenteeism

    Time frame: The investigators will follow employees' absenteeism for five to six months

    The investigators will measure absenteeism in employees who received a flu shot versus employees who did not receive a flu shot.

  2. Demographic characteristics on flu shot participation

    Time frame: Up to 3 years

    The investigators will explore how demographic characteristics correlate to employees receiving an influenza vaccination.

Sponsors and collaborators

Lead sponsor

National Bureau of Economic Research, Inc.

Other

Collaborators

  • National Institute on Aging (NIA)

Registry information

Important dates

Study start
2011
Primary completion
2012
Study completion
2012
First posted
Oct 20, 2011
Registry last updated
Dec 18, 2017

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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