Sources & references
From the app’s English Help & Guide · Reference release 1.0.27
Tended is a personal health companion, not a medical device. It does not provide medical advice, diagnosis, or treatment. The following published sources inform specific features within the app.
Bristol Stool Scale
Bowel tracking uses the Bristol Stool Scale (Types 1–7), a validated clinical tool for classifying stool form.
Source: Lewis SJ, Heaton KW. “Stool form scale as a useful guide to intestinal transit time.” Scandinavian Journal of Gastroenterology, 1997; 32(9): 920–924.
Fibromyalgia pain areas
The body map overlay for fibromyalgia highlights commonly affected areas based on the American College of Rheumatology classification criteria.
Source: Wolfe F, et al. “The American College of Rheumatology 1990 Criteria for the Classification of Fibromyalgia.” Arthritis and Rheumatism, 1990; 33(2): 160–172.
Updated: Wolfe F, et al. “2016 Revisions to the 2010/2011 Fibromyalgia Diagnostic Criteria.” Seminars in Arthritis and Rheumatism, 2016; 46(3): 319–329.
Rheumatoid arthritis joint assessment
The body map overlay for rheumatoid arthritis highlights joints used in standard clinical assessment.
Source: Prevoo ML, et al. “Modified disease activity scores that include twenty-eight-joint counts.” Arthritis and Rheumatism, 1995; 38(1): 44–48.
Post-exertional malaise (PEM)
PEM is a recognised clinical symptom of ME/CFS and related conditions. Tended’s PEM tracking and delay calculation help users document their personal patterns.
Sources: • Institute of Medicine. “Beyond Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Redefining an Illness.” National Academies Press, 2015. • Carruthers BM, et al. “Myalgic Encephalomyelitis: International Consensus Criteria.” Journal of Internal Medicine, 2011; 270(4): 327–338.
Menstrual cycle phases
Cycle phase analysis uses the standard four-phase model (menstrual, follicular, ovulatory, luteal) based on established reproductive endocrinology.
Source: American College of Obstetricians and Gynecologists (ACOG). “The Menstrual Cycle.” acog.org.
Joint event descriptors
Joint descriptors for EDS and hypermobility conditions (subluxation, dislocation, hypermobility) use terminology from the international EDS classification.
Source: Malfait F, et al. “The 2017 International Classification of the Ehlers–Danlos Syndromes.” American Journal of Medical Genetics Part C, 2017; 175(1): 8–26.
Condition descriptions
Condition names and descriptions are informed by published diagnostic criteria and clinical resources including the International Classification of Diseases (ICD-10/ICD-11), published by the World Health Organization.
How Tended uses your data
All correlations, patterns, flare warnings, and trend analyses in Tended are statistical observations based entirely on your own self-reported journal data. They are not derived from clinical datasets, are not clinically validated, and should not be used as a substitute for professional medical advice.