1. Is Sleep Apnea a Winter Disease?
Cristiane Maria Cassol, PT, MSc, Denis Martinez, MD, PhD, Fernando Augusto Boeira Sabino da Silva, MSc, Marcia Kraide Fischer, PT, MSc, Maria do Carmo Sfreddo Lenz, MD, PhD, Ângelo José Gonçalves Bós, MD, PhD 
CHEST 
Volume 142, Issue 6, Pages (December 2012)
DOI: /chest
Copyright © 2012 The American College of Chest Physicians Terms and Conditions

2. Figure 1
Cosinor curves averaging 10 years of data on sex, age, BMI, neck circumference, apnea-hypopnea index (AHI), and lowest oxygen saturation. n.s. = nonsignificant.
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Copyright © 2012 The American College of Chest Physicians Terms and Conditions

3. Figure 2
Percentage of normal, mild, moderate, and severe AHI in cold weather (gray bars) and warm weather. The significance of the differences in percentages was obtained by the χ2 test. Error bars represent 95% CIs. AH = apnea-hypopnea; OSA = obstructive sleep apnea. See Figure 1 legend for expansion of other abbreviations.
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Copyright © 2012 The American College of Chest Physicians Terms and Conditions

4. Figure 3
Box plots of AHI in cold weather (gray boxes) and warm weather (white boxes) by year. See Figure 1 legend for expansion of abbreviation.
CHEST  , DOI: ( /chest )
Copyright © 2012 The American College of Chest Physicians Terms and Conditions