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.
Detailed analysis of the response rate of the telephone interview. Note: Refusal: participant verbally refuses to give the interview or does not want to take part; Dropout: participant drops out during the interview; Answering machine: automatic machinery response; Non-contact: participant does not answer the phone despite free line signal.
