MOS Sleep Scale

Intended to assess the extent of sleep problems, the MOS Sleep Scale measures six dimensions of sleep, including initiation, maintenance (e.g. staying asleep), quantity, adequacy, somnolence (e.g. drowsiness) and respiratory impairments (e.g. shortness of breath, snoring). Disturbed sleep has a major impact on quality of life and is often a common symptom of many other chronic conditions, such as chronic pain and mood disorders.

The MOS Sleep Scale was originally developed in the Medical Outcomes Study (MOS), but has recently been revised. The new form, the MOS Sleep Scale–Revised (MOS Sleep–R), differs from the original in that it has five response options, rather than six, for each question. The response option "a good bit of the time" has been eliminated. This change was made based on findings from SF-36® Health Survey translation studies (Keller, Ware, Gandek et al., 1998), that this response choice was not consistently ordered in relation to other adjacent response choices ("most of the time" and "some of the time"). Eliminating this response option simplified the format of the form with little or no loss of information.

The reliability and validity of the MOS Sleep Scale have been evaluated in a number of disease areas, including neuropathic pain, restless leg syndrome, overactive bladder and rheumatoid arthritis. It has also been evaluated in the U.S. general population. Starting in 2010, the MOS Sleep Scale is available with patient and aggregate reports and a single standardized scoring engine. Updated U.S. norms are also available using 2009 survey results.

Optum™ distributes language translations of two versions of the MOS Sleep Scale: a 12-question version and a six-question version.

Intended for adults 18 years of age and older, the forms are available in a fixed form mode of administration, with a standard four-week recall period. Some language translations of the 12-question form are also offered with an acute one-week recall period.