Below is a chart and brief excerpt from today's Early Look written by Demography analyst Neil Howe.
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A large, survey-based study of positives in California and Nevada found that 42% reported at least one Long Covid symptom after 30 days and 24% did so after 90 days. Long Covid after 90 days is a more durable problem because at that point symptom prevalence decays much more slowly. The newer and larger studies may begin to narrow the wide range of estimates of just what that prevalence is. While WHO's most recent advisory issued in February offers a low figure (10%) for symptoms after 12 weeks, WHO concedes that the published figures range very widely depending upon the methodology of the study. Its summary of various studies, most of them with small n sizes, demonstrates that this range is indeed all over the map. |
