Cohort Studies

Publication Title: 
BMC musculoskeletal disorders

BACKGROUND: Current studies comparing musculoskeletal pain levels between the genders focus on a single point in time rather than measuring change over time. The purpose of this study is to compare pain levels between males and females before and after treatment. METHODS: Eleven different patient cohorts (3,900 patients) included in two prospective outcome databases collected pain data at baseline and 1 month after treatment. Treatments were either imaging-guided therapeutic injections or chiropractic therapy.

Author(s): 
Peterson, Cynthia K.
Humphreys, B. Kim
Hodler, Jürg
Pfirrmann, Christian W. A.
Publication Title: 
BMC pregnancy and childbirth

BACKGROUND: Recent declines in the provision of prenatal care by family physicians and the integration of midwives into the Canadian health care system have led to a shift in the pattern of prenatal care provision; however it is unknown if this also impacts use of other health services during pregnancy. This study aimed to assess the impact of the type of prenatal care provider on the self-reported use of ancillary services during pregnancy.

Author(s): 
Metcalfe, Amy
Grabowska, Kristen
Weller, Carol
Tough, Suzanne C.
Publication Title: 
Journal of Occupational Rehabilitation

PURPOSE: To describe the health care utilization of injured workers who made a workers' compensation claim for neck pain. METHODS: We conducted a cohort study of injured workers who made an incident claim involving neck pain to the Ontario Workplace Safety and Insurance Board between 1997 and 1998. We linked their workers' compensation and Ontario Health Insurance Plan files to collect all health care services accrued during the year prior to and 2 years after the claim was initiated. We report the 7 day simple moving average of health care services per 1,000 claimants per day.

Author(s): 
Côté, Pierre
Yang, Xiaoqing
Kristman, Vicki
Hogg-Johnson, Sheilah
Van Eerd, Dwayne
Rezai, Mana
Vidmar, Marjan
Publication Title: 
Journal of Manipulative and Physiological Therapeutics

OBJECTIVES: The purpose of this study was to compare self-reported pain and "improvement" of patients with symptomatic, magnetic resonance imaging-confirmed, lumbar disk herniations treated with either high-velocity, low-amplitude spinal manipulative therapy (SMT) or nerve root injections (NRI). METHODS: This prospective cohort comparative effectiveness study included 102 age- and sex-matched patients treated with either NRI or SMT. Numerical rating scale (NRS) pain data were collected before treatment.

Author(s): 
Peterson, Cynthia K.
Leemann, Serafin
Lechmann, Marco
Pfirrmann, Christian W. A.
Hodler, Juerg
Humphreys, B. Kim
Publication Title: 
Journal of Manipulative and Physiological Therapeutics

OBJECTIVE: The purpose of this study was to investigate the effect of chiropractic on 5 outcomes among Medicare beneficiaries: increased difficulties performing activities of daily living (ADLs), instrumental ADLs (IADLs), and lower body functions, as well as lower self-rated health and increased depressive symptoms.

Author(s): 
Weigel, Paula Anne
Hockenberry, Jason
Bentler, Suzanne
Wolinsky, Fredric D.
Publication Title: 
Archives of Physical Medicine and Rehabilitation

OBJECTIVE: To describe the 1-year course of symptoms following mild traumatic brain injury (MTBI) sustained in a motor vehicle collision as well as patterns of care-seeking. DESIGN: One-year follow-up of a population-based inception cohort. SETTING: The province of Saskatchewan, Canada, with a population of about 1,000,000 inhabitants. PARTICIPANTS: Persons (N=1716) sustaining an MTBI during a car collision between November 1997 and December 1999. INTERVENTIONS: Not applicable.

Author(s): 
Hartvigsen, Jan
Boyle, Eleanor
Cassidy, J. David
Carroll, Linda J.
Publication Title: 
Journal of Manipulative and Physiological Therapeutics

OBJECTIVE: The purposes of this study were to evaluate patients with low-back pain (LBP) and leg pain due to magnetic resonance imaging-confirmed disc herniation who are treated with high-velocity, low-amplitude spinal manipulation in terms of their short-, medium-, and long-term outcomes of self-reported global impression of change and pain levels at various time points up to 1 year and to determine if outcomes differ between acute and chronic patients using a prospective, cohort design.

Author(s): 
Leemann, Serafin
Peterson, Cynthia K.
Schmid, Christof
Anklin, Bernard
Humphreys, B. Kim
Publication Title: 
World journal of gastroenterology: WJG

AIM: To estimate the direct medical costs of gastroenterological diseases within the universal health insurance program among the population of local residents in Taiwan. METHODS: The data sources were the first 4 cohort datasets of 200,000 people from the National Health Insurance Research Database in Taipei. The ambulatory, inpatient and pharmacy claims of the cohort in 2001 were analyzed. Besides prevalence and medical costs of diseases, both amount and costs of utilization in procedures and drugs were calculated.

Author(s): 
Chou, Li-Fang
Publication Title: 
Journal of Alternative and Complementary Medicine (New York, N.Y.)

OBJECTIVES: To investigate the efficacy of an herbal formula in the prevention of severe acute respiratory syndrome (SARS) transmission among health care workers. The secondary objectives are to investigate quality of life (QOL) and symptomology changes among supplement users, and to evaluate the safety of this formula. DESIGN: Controlled clinical trial. SETTINGS: Hong Kong during epidemic of SARS.

Author(s): 
Lau, Joseph T. F.
Leung, P. C.
Wong, E. L. Y.
Fong, C.
Cheng, K. F.
Zhang, S. C.
Lam, C. W. K.
Wong, V.
Choy, K. M.
Ko, W. M.
Publication Title: 
Zhong Xi Yi Jie He Xue Bao = Journal of Chinese Integrative Medicine

Cohort study is graded as level II in evidence grading system of evidence-based medicine, secondary to randomized controlled trial. It is one of the important evidence for the evaluation of health care interventions, and it has been applied recently in the evaluation of traditional medicine. The author of the article introduces the basic concept, principle, design, and implementation as well as relevant methodological issues when applied in traditional Chinese medicine.

Author(s): 
Liu, Jian-Ping

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