Motorized Scooters: Boon or Bane?

      We read with interest the report by Zagol and Krasuski
      • Zagol B.W.
      • Krasuski R.A.
      Effect of motorized scooters on quality of life and cardiovascular risk.
      on motorized scooters. The investigators suggested that scooters can have detrimental long-term effects on cardiovascular risk and that their findings pertinent to risk should influence physician practice. We are concerned that the study's methods do not support such a conclusion. Specific limitations include the following: (1) the use of a retrospective cohort study design with no attempt to account for other factors potentially affecting outcomes (e.g., by using statistical, case-matched, or historical control), (2) incomplete data on other treatment pertinent to the outcomes being studied, and (3) very low survey response rates. These limitations must be considered in interpreting the study findings.
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        • Zagol B.W.
        • Krasuski R.A.
        Effect of motorized scooters on quality of life and cardiovascular risk.
        Am J Cardiol. 2010; 105: 672-676
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      Linked Article

      • Effect of Motorized Scooters on Quality of Life and Cardiovascular Risk
        American Journal of CardiologyVol. 105Issue 5
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          Physical inactivity increases cardiovascular risk. The possible adverse effects of regular motorized scooter use, recently popularized for patients with physical limitations, has not been previously examined. We performed a single-center, retrospective cohort study of 102 consecutive patients who had obtained medical approval for, and subsequently received, a motorized scooter during a 6-year period. The clinical data were collected for the 12 months before and after the intervention. Surveys assessing 11 different facets of health-related quality of life were returned by 28% of patients.
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        American Journal of CardiologyVol. 106Issue 4
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          Dr. Hoenig et al highlight some of the intrinsic limitations of our retrospective cohort study. Although no control group was used, the annual incidence and prevalence of diabetes in our study group over the 1 year of follow-up was dramatically higher than expected in the general population. According to the Centers for Disease Control and Prevention, the average age-adjusted annual incidence rate of diabetes in adults from 2005 to 2007 was 11.1 per 1,000 individuals in Texas and 9.1 per 1,000 individuals for the entire United States population.
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