Kayser, Bengt, Andrea Aliverti, Riccardo Pellegrino, Raffaele Dellaca, Marco Quaranta, Pasquale Pompilio, Giuseppe Miserocchi, and Annalisa Cogo. Comparison of a visual analogue scale and Lake Louise symptom scores for acute mountain sickness. High Alt. Med. Biol. 11:69-72, 2010.-Assessment of the presence and severity of acute mountain sickness (AMS) is based on subjective reporting of the sensation of symptoms. The Lake Louise symptom scoring system (LLS) uses categorical variables to rate the intensity of AMS-related symptoms (headache, gastrointestinal distress, dizziness, fatigue, sleep quality) on 4-point ordinal scales; the sum of the answers is the LLS self-score (range 0-15). Recent publications indicate a potential for a visual analogue scale (VAS) to quantify AMS. We tested the hypothesis that overall and single-item VAS and LLS scores scale linearly. We asked 14 unacclimatized male subjects [age 41 (14), mean (SD) yr; height 176 (3)cm; weight 75 (9)kg] who spent 2 days at 3647m and 4 days at 4560m to fill out LLS questionnaires, with a VAS for each item (i) and a VAS for the overall (o) sensation of AMS, twice a day (n=172). Even though correlated (r=0.84), the relationship between LLS(o) and VAS(o) was distorted, showing a threshold effect for LLS(o) scores below 5, with most VAS(o) scores on one side of the identity line. Similar threshold effects were seen for the LLS(i) and VAS(i) scores. These findings indicate nonlinear scaling characteristics that render difficult a direct comparison of studies done with either VAS or LLS alone. © Copyright 2010, Mary Ann Liebert, Inc. 2010.
Kayser, B., Aliverti, A., Pellegrino, R., Dellaca, R., Quaranta, M., Pompilio, P., et al. (2010). Comparison of a visual analogue scale and Lake Louise symptom scores for acute mountain sickness. HIGH ALTITUDE MEDICINE & BIOLOGY, 11(1), 69-72 [10.1089/ham.2009.1046].
Comparison of a visual analogue scale and Lake Louise symptom scores for acute mountain sickness
MISEROCCHI, GIUSEPPE ANDREA;
2010
Abstract
Kayser, Bengt, Andrea Aliverti, Riccardo Pellegrino, Raffaele Dellaca, Marco Quaranta, Pasquale Pompilio, Giuseppe Miserocchi, and Annalisa Cogo. Comparison of a visual analogue scale and Lake Louise symptom scores for acute mountain sickness. High Alt. Med. Biol. 11:69-72, 2010.-Assessment of the presence and severity of acute mountain sickness (AMS) is based on subjective reporting of the sensation of symptoms. The Lake Louise symptom scoring system (LLS) uses categorical variables to rate the intensity of AMS-related symptoms (headache, gastrointestinal distress, dizziness, fatigue, sleep quality) on 4-point ordinal scales; the sum of the answers is the LLS self-score (range 0-15). Recent publications indicate a potential for a visual analogue scale (VAS) to quantify AMS. We tested the hypothesis that overall and single-item VAS and LLS scores scale linearly. We asked 14 unacclimatized male subjects [age 41 (14), mean (SD) yr; height 176 (3)cm; weight 75 (9)kg] who spent 2 days at 3647m and 4 days at 4560m to fill out LLS questionnaires, with a VAS for each item (i) and a VAS for the overall (o) sensation of AMS, twice a day (n=172). Even though correlated (r=0.84), the relationship between LLS(o) and VAS(o) was distorted, showing a threshold effect for LLS(o) scores below 5, with most VAS(o) scores on one side of the identity line. Similar threshold effects were seen for the LLS(i) and VAS(i) scores. These findings indicate nonlinear scaling characteristics that render difficult a direct comparison of studies done with either VAS or LLS alone. © Copyright 2010, Mary Ann Liebert, Inc. 2010.
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