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For the steps dataset, w e analyzed 45,556,148 data points for 40,808 users from 34 countries. The study population was composed of 23,989/40,659 (59%) men and 16,819/41022 (41%) women with a mean age of 47 (SD 12.6) years.
Flowchart of the 3 study populations, detailing the number of users and data points included in each dataset, based on data collected from Withings Steel heart rate activity tracker users across 34 countries.
J Med Internet Res 2025;27:e68199
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Telemedicine as a tool for PrEP delivery during the COVID-19 pandemic in a large HIV prevention service in Rio de Reference 39: Organização, processamento, análise e interpretação de dados: o desafio da triangulação Reference 43: A (in)visibilidade gênero no currículo e na prática de duas especialidades médicas Reference 58: Saúde de Lésbicas, Gays, Bissexuais, Travestis e Transexuais: da Formação Médica à Atuação Reference 59: Gênero e Sexualidade nas Escolas Médicas Federais do Brasil: uma Análise de Projetos Pedagógicos
J Med Internet Res 2025;27:e67445
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Logistic regression is a classification model used in ML that applies a linear combination of the data X, with weights W, to discriminate between classes of the dependent variable Y. It models the probability of an outcome using a logistic (sigmoid) function:
(1)
Since the equation consists of a linear combination of the features transformed by a sigmoid function, each weight of the model directly corresponds to the weight of a feature in determining the output.
JMIR Med Inform 2025;13:e64617
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