- Title
- The validity of a new structured assessment of gastrointestinal symptoms scale (SAGIS) for evaluating symptoms in the clinical setting
- Creator
- Koloski, N. A.; Jones, M.; Talley, N. J.; Holtmann, G.; Hammer, J.; von Wulffen, M.; Shah, A.; Hoelz, H.; Kutyla, M.; Burger, D.; Martin, N.; Gurusamy, S. R.
- Relation
- NHMRC 1084544 http://purl.org/au-research/grants/nhmrc/1084544
- Relation
- Digestive Diseases and Sciences Vol. 62, Issue 8, p. 1913-1922
- Publisher Link
- http://dx.doi.org/10.1007/s10620-017-4599-6
- Publisher
- Springer
- Resource Type
- journal article
- Date
- 2017
- Description
- Background: The clinical assessments of patients with gastrointestinal symptoms can be time-consuming, and the symptoms captured during the consultation may be influenced by a variety of patient and non-patient factors. To facilitate standardized symptom assessment in the routine clinical setting, we developed the Structured Assessment of Gastrointestinal Symptom (SAGIS) instrument to precisely characterize symptoms in a routine clinical setting. Aims: We aimed to validate SAGIS including its reliability, construct and discriminant validity, and utility in the clinical setting. Methods: Development of the SAGIS consisted of initial interviews with patients referred for the diagnostic work-up of digestive symptoms and relevant complaints identified. The final instrument consisted of 22 items as well as questions on extra intestinal symptoms and was given to 1120 consecutive patients attending a gastroenterology clinic randomly split into derivation (n = 596) and validation datasets (n = 551). Discriminant validity along with test–retest reliability was assessed. The time taken to perform a clinical assessment with and without the SAGIS was recorded along with doctor satisfaction with this tool. Results: Exploratory factor analysis conducted on the derivation sample suggested five symptom constructs labeled as abdominal pain/discomfort (seven items), gastroesophageal reflux disease/regurgitation symptoms (four items), nausea/vomiting (three items), diarrhea/incontinence (five items), and difficult defecation and constipation (2 items). Confirmatory factor analysis conducted on the validation sample supported the initially developed five-factor measurement model (χ2193=892.2, p < 0.0001, χ2/df = 4.6, CFI = 0.90, TLI = 0.88, RMSEA = 0.08). All symptom groups demonstrated differentiation between disease groups. The SAGIS was shown to be reliable over time and resulted in a 38% reduction of the time required for clinical assessment. Conclusions: The SAGIS instrument has excellent psychometric properties and supports the clinical assessment of and symptom-based categorization of patients with a wide spectrum of gastrointestinal symptoms.
- Subject
- questionnaire development; validation; irritable bowel syndrome; quality of life; gastrointestinal symptoms
- Identifier
- http://hdl.handle.net/1959.13/1357010
- Identifier
- uon:31849
- Identifier
- ISSN:0163-2116
- Language
- eng
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