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An external validation study evaluates the performance of a prediction model in new data, but many of these studies are too small to provide reliable answers. In the third article of their series on model evaluation, Riley and colleagues describe how to calculate the sample size required for external validation studies, and propose to avoid rules of thumb by tailoring calculations to the model and setting at hand. External validation studies evaluate the performance of one or more prediction models (eg, developed previously using statistical, machine learning, or artificial intelligence approa...

The authors developed and validated an accurate, well-calibrated, easy-to-implement COVID-19 hospitalized patient deterioration index to identify patients at high or low risk of clinical deterioration.

Depression after miscarriage is common and involves sadness, grief, and emotional distress. Learn about symptoms and how coping techniques can help 2023.

Depression after miscarriage is common and involves sadness, grief, and emotional distress. Learn about symptoms and how coping techniques can help 2023.

Depression after miscarriage is common and involves sadness, grief, and emotional distress. Learn about symptoms and how coping techniques can help 2023.