Effects of Tysabri (BG00002) Over 12 Months on MS Related Fatigue in Participants With RRMS

A fatigue scale for motor and cognitive functions (FSMC) has been developed and validated by Penner et al. FSMC differentiates between motor and cognitive fatigue and is less susceptible to confounding by depression. Thus, FSMC is more specific in measuring MS-related fatigue.

Capacity for Work Questionnaire (CWQ) is used to collect data regarding number of working hours and sickness absence.

The SF-12 is a multipurpose short form survey with 12 questions, all selected from the SF-36 Health Survey. The questions were combined, scored, and weighted to create two scales that provide glimpses into mental and physical functioning and overall HRQOL. Physical and Mental Health Composite Scores (PCS & MCS) are computed using the scores of twelve questions and range from 0 to 100, where a zero score indicates the lowest level of health and 100 indicates the highest level of health.

The ESS is a self-administered 8-item questionnaire with that provides a measure of a person's general level of daytime sleepiness, or their average sleep propensity in daily life. Each question is rated on a 4-point scale (0 - 3), their usual chances of dozing off or falling asleep in 8 different situations or activities that most people engage in as part of their daily lives, although not necessarily every day. The total ESS score is the sum of 8 item-scores and can range between 0 and 24, where higher scores indicate higher levels of a person's level of daytime sleepiness.

The PASAT is a measure of cognitive function that assesses auditory information processing speed and flexibility, as well as calculation ability. Single digits are presented every 3 seconds and the patient must add each new digit to the one immediately prior to it. The PASAT is the third and last component of the MSFC. SDMT is a screening test for cognitive impairment. Participants are given 90 seconds in which to pair specific numbers with given geometric figures using a key. Scores range from 0 to 110 (best).

CES-D is a self-report measure of depression severity.

The Borg Scale measures perceived exertion. It is used to document the patient's exertion during a test. It ranges from 6 to 20, where 6 means "no exertion at all" and 20 means "maximal exertion.

The six-minute walk test (6MWT) measures the distance an individual is able to walk over a total of six minutes on a hard, flat surface. The goal is for the individual to walk as far as possible in six minutes.

The EDSS measures disability status on a scale ranging from 0 to 10, with higher scores indicating more disability. Scoring is based on measures of impairment in eight functional systems on examination by a neurologist.