Fig. 1
From: Health impacts of a cold wave and its economic loss assessment in China’s high-altitude city, Xining
Cumulative effect of cold spells on mortality for days 0–21 under the nine cold spell definitions, stratified by sex, age, level of education and cause (Non-accidental, Circulatory disease, IHD, Stroke, Respiratory disease, COPD, Tumor, and Diabetes mellitus). Cold spells were defined by the percentile temperature threshold (5th, 7.5th, or 10th percentiles) and by the number of consecutive days below the threshold (2–4 days, indicated by D2, D3, D4). “Low” represents junior high school and below, and “High” represents high school and higher