Buchwald, D, Pearlman, T, Umali, J et al. · The American journal of medicine · 1996 · DOI
This study used a health survey (SF-36) to measure how much ME/CFS affects daily activities in 185 patients, comparing them to people with other illnesses and healthy controls. ME/CFS patients had the lowest scores, meaning the most disability, especially in physical activities, work, and pain. The survey was useful for showing that ME/CFS causes more functional impairment than other conditions like depression or infectious mononucleosis.
This study provides evidence that ME/CFS causes substantial, measurable functional impairment that is distinguishable from other common illnesses, validating patient-reported disability and supporting the use of standardized assessment tools in clinical practice. The findings help clinicians and researchers quantify ME/CFS severity objectively and understand which factors (fatigue severity, fibromyalgia, employment status) most influence quality of life.
This study does not establish what causes ME/CFS or prove that fatigue severity directly causes functional impairment—only that they are associated. The cross-sectional design means we cannot determine whether functional limitations precede or result from the disease. The study also cannot distinguish ME/CFS from unexplained chronic fatigue using the SF-36 alone, suggesting the survey measures general disability rather than disease-specific features.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Buchwald, D, Pearlman, T, Umali, J, Schmaling, K, & Katon, W (1996). Functional status in patients with chronic fatigue syndrome, other fatiguing illnesses, and healthy individuals.. The American journal of medicine. https://doi.org/10.1016/S0002-9343(96)00234-3
BibTeX
@article{mecfsatlas-buchwald-1996-functional-status,
author = {Buchwald, D and Pearlman, T and Umali, J and Schmaling, K and Katon, W},
title = {Functional status in patients with chronic fatigue syndrome, other fatiguing illnesses, and healthy individuals.},
journal = {The American journal of medicine},
year = {1996},
doi = {10.1016/S0002-9343(96)00234-3},
note = {PubMed: 8873506},
url = {https://www.mecfsatlas.com/evidence/buchwald-1996-functional-status},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/buchwald-1996-functional-status
Contribute
Private, reviewed by a human. Not a public comment thread.