The NSF conducts Sleep in America polls annually, with the release of the results timed to coincide with National Sleep Awareness Week, which is the week before the change to Daylight Savings time in the spring. The topics and questions included in the poll are selected by a subset of volunteers and board members, and there is no commercial or industry influence on this poll. Since the diagnosis of RLS is made on the basis of a history of uncomfortable leg sensations that are worsened with inactivity and occur at night, it is possible and appropriate to learn about the prevalence and risks of this cluster of symptoms in a survey of sleep habits. To date, no random sample of RLS prevalence specifically in the US population has been undertaken. inhalers for asthma
A random sample of telephone numbers was purchased, and quotas were established by region and age, based on US Census household data. The total sample size was designed to be 1,500 participants. Telephone interviews were conducted between September 20 and November 7, 2004, resulting in a random sample of 1,506 adults. The interviews averaged 20 min in duration. In order to qualify for inclusion in the survey, participants had to be community-dwelling (ie, not residing in institutions), > 18 years of age, and living within the continental United States. Interviewers explained the poll to participants by reading a script, which stated, “I am calling on behalf of the National Sleep Foundation to conduct a survey about sleep among Americans. This is not a sales call; it is a national research survey. It will take a few minutes of your time and your responses will be kept strictly confidential.” Respondents gave verbal consent to participate in this voluntary study, and their consent was further demonstrated by their willingness to answer the questions asked.
Participants were told that they could refuse to answer any question. A total of 26,847 households were called; 4,343 households did not answer repeated phone calls, and 4,168 potential participants refused.