Effects of different invitation strategies on participation in a cohort study of Iranian public sector employees: a cluster randomized trial.

ABSTRACT:

Background

Identifying strategies to optimize participation in health studies is one of the major concerns for researchers. The purpose of this study was to evaluate the efficiency of different invitation strategies on participation rate in the Employees' Health Cohort Study of Iran (EHCSIR).

Methods

Two cluster-randomized trials were carried out to assess the outcomes of different invitation strategies. In the first phase, 7 units with 1880 employees (3 hospitals, 3 health centers, and 1 office) were assigned to the three parallel modes of invitation: 1) invitation letter, 2) phone call and 3) Short Message Service (SMS). In the second phase, 6 hospitals with 1633 employees were allocated to two invitation methods: 1) invitation letter, 2) invitation letter plus EHCSIR proj

SUBMITTER: Rajabzadeh R 

PROVIDER: S-EPMC8502307 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature