Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Sensitivity analysis excluding studies at high risk of bias. app: mobile phone application; audio: audio recording; CrI: credibility interval; Guaranteed: guaranteed financial incentives; IVR: interactive voice response; Not guaranteed: Non‐guaranteed financial incentives (e.g. competitions); OR: odds ratio; SMS: short messaging service (text message); Web: Internet.
