Thus, the participation rate calculated by taking the number of completed interviews divided by the number of completed interviews plus the number of contacted households who refused participation or did not qualify was 23%. Institutional review board approval was not required to conduct or publish the results of a poll without any individual identifying information that is conducted by a nonprofit independent organization. There was no compensation for participation. Here
Approximately 80% of the interviews were conducted on weekdays between 5:00 pm and 8:00 pm, on Saturdays between 10:00 am and 4:00 pm, and on Sundays between 4:00 pm and 8:00 pm by professional interviewers from WB&A Market Research (Annapolis, MD) on behalf of the NSF.
To address the prevalence of those at risk for RLS, we chose to use one of the standard questions developed by The International Restless Legs Syndrome Study Group to assess RLS prevalence in surveys: “In the past year, according to your own experiences or what others tell you, how often did you have unpleasant feelings in your legs like creepy, crawly or tingly feelings at night with an urge to move when you lie down to sleep?” The possible responses were as follows: every night or almost every night; a few nights a week; a few nights a month; rarely; and never.
Those who answered that they had these feelings at least a few nights a week were asked the following question: “Would you say these feelings in your legs are worse, about the same as, or better at night or in the evening compared to other times of day?” The response choices were as follows: worse at night; about the same as; or better at night. Individuals were designated as being likely to have RLS if they endorsed unpleasant feelings at least a few nights a week and said that those feelings were worse at night.