Activate Now
ProHealth me-cfs Vitamin and Natural Supplement Store and Health
Home  |  Log In  |  My Account  |  View Cart  View Your ProHealth Vitamin and Supplement Shopping Cart
800-366-6056  |  Contact Us  |  Help

Fibromyalgia  Chronic Fatigue Syndrome & M.E.  Lyme Disease  Natural Wellness  Supplement News  Forums  Our Story
Store     Brands   |   A-Z Index   |   Best Sellers   |   New Products   |   Deals & Specials   |   Under $10   |   SmartSavings Club

Trending News

Abundant Energy Summit: Dr. Myhill speaks about the role of mitochondrial function in ME/CFS

Alcohol intolerance in CFS - gives us a clue as to the mechanisms of fatigue

The "Mind Diet" Reduces the Risk Of Alzheimer’s Dementia. Might It Also Help the Brain Fog Found Wit...

Need Help with Pain Management? There's an App for That

Simplifying Nutritional Support in CFS & Fibromyalgia

How Walking to Bathroom Can Be Harder Than Running a Marathon: A Doctor’s ME/CFS Case Study

Ask the Doctor: Is CFS an onset to fibromyalgia? What is the difference?

How Multiple Chronic Illnesses Shaped One Woman Into a Patient Advocate

Fighting Fatigue with Ground-breaking French Oak Wood Extract

Is Your Body Your Friend and Healing Ally?

Print Page
Email Article

Effects of Time Frame on the Recall Reliability of CFS Symptoms

  [ 3 votes ]   [ Discuss This Article ]
By M Evans and LA Jason • • October 25, 2013

Editor's Comment: Meredyth Evans wrote her Master's thesis on the reliability of questionnaires for patients with ME/CFS, specifically addressing how this method is applied in the "empirical" case definition for diagnosing the illness. The empirical case definition expands the Fukuda case definition by including questionnaires as assessment tools. As Evans discussed in her thesis, a person's recall of the severity of symptoms she or he has experienced is influenced by a variety of factors, including whether the symptoms have been consistent. 

Although this study does not rule out the validity of questionnaires for supporting a case definition, it does examine some of the pitfalls of using time frames to assess symptoms. Evans discovered that the more stable a symptom was, the easier it was to remember. Waxing and waning symptoms are one of the key features of this illness, especially during acute phases, which means patients might have greater problems with recall if they are in relapse. However, two of the Fukuda definition symptoms that Evans explored - sore throat and cognitive problems - did not fit into this model. "It is possible," she says, "that this impact on reliability is due to the fact that people are having difficulty concentrating on what the question is asking them; thus having difficulty reliably recalling their concentration problems..."

Evans concluded that time frame, symptom stability, and momentary severity do appear to influence reliability in reporting ME/CFS symptoms.These factors must be taken into account, because "[a]ccurate and reliable assessment is a crucial first step in understanding and treating this debilitating and often misunderstood illness."

To read the full text of "Effects of Time Frame on the Recall Reliability of CFS Symptoms" click HERE.

By M. Evans and L.A. Jason


This study serves as an investigation of the reliability of symptom data as reported by individuals with chronic fatigue syndrome (CFS), across three recall time frames (the past week, the past month, and the past 6 months), and at two assessment points (with 1 week in between each assessment). Multilevel model analyses were used to determine the optimal recall time frame, in terms of test -retest reliability, for each of the Fukuda et al. (1994) case defining symptoms.

Results suggested that the optimal time frame for reliably reporting CFS symptoms was six months for sore throat, lymph node pain, muscle pain, post-exertional malaise, headaches, memory/concentration difficulties, and unrefreshing sleep. For joint pain, the optimal time frame was one month.

Researchers who are interested in the assessment of CFS symptoms need to take recall time frame into account, especially when the intended goal is to standardize and improve the methods used to reliably and accurately diagnose this complex illness.

Source: Eval Health Prof. 2013 Sep 23. [Epub ahead of print]. Evans M, Jason LA.

Please Discuss This Article:   Post a Comment 

[ Be the first to comment on this article ]

Free Chronic Fatigue Syndrome and Fibromyalgia Newsletters
Subscribe to
Subscribe Now!
Receive up-to-date ME/CFS, Fibromyalgia & Lyme Disease treatment and research news
 Privacy Guaranteed  |  View Archives

Vitamins and Supplements for ME/CFS Support

Featured Products

Mitochondria Ignite™ with NT Factor® Mitochondria Ignite™ with NT Factor®
Reduce Fatigue up to 45%
B-12 Extreme™ B-12 Extreme™
The Most Potent Vitamin B-12 on Earth
Hydroxocobalamin Extreme™ Hydroxocobalamin Extreme™
The B-12 your brain needs for detox & sharpness
Ultra ATP+, Double Strength Ultra ATP+, Double Strength
Get energized with malic acid & magnesium
MitoQ® MitoQ®
Powerful Antioxidant Support to Mitochondria

Natural Remedies

Eating Fat is Good… Maybe… Could Be… Sometimes Eating Fat is Good… Maybe… Could Be… Sometimes
Strontium - The Missing Mineral for Strong Bones Strontium - The Missing Mineral for Strong Bones
Coconut Oil - Healthy Gifts from the 'Tree of Life' Coconut Oil - Healthy Gifts from the 'Tree of Life'
Everything You Always Wanted to Know About Sleep But Were Too Tired to Ask Everything You Always Wanted to Know About Sleep But Were Too Tired to Ask
Energy Breakthrough - One Fibromyalgia Patient’s Fortuitous Discovery Energy Breakthrough - One Fibromyalgia Patient’s Fortuitous Discovery

What is Fibromyalgia?
Fibromyalgia Diagnosis
Fibromyalgia Symptoms
Fibromyalgia Causes
Fibromyalgia Treatments
Fibromyalgia Diet
Fibromyalgia Medications
M.E. & CFS
What is M.E./CFS?
M.E./CFS Diagnosis
M.E./CFS Symptoms
M.E./CFS Causes
M.E./CFS Treatments
M.E./CFS Diet
M.E./CFS Medications
What is Lyme Disease?
Lyme Disease Diagnosis
Lyme Disease Symptoms
Lyme Disease Causes
Lyme Disease Treatments
Lyme Disease Diet
Lyme Disease Medications
M.E. & CFS
Lyme Disease
General Health
ProHealth on Facebook  ProHealth on Twitter  ProHealth on Pinterest  ProHealth on Google Plus
Credit Card Processing