Gender-specific nonlinear associations between depressive symptoms and all-cause mortality in older adults a prospective cohort study.csv

Background and Data SourceThis dataset is derived from the National Health and Nutrition Examination Survey (NHANES) conducted between 2005 and 2018, with mortality data linked to the National Death Index, providing comprehensive follow-up until 2019. The study focuses on understanding the complex relationship between depressive symptoms and mortality in older adult populations.Study ObjectiveThe primary aim was to investigate gender-specific nonlinear associations between depressive symptoms, measured by the Patient Health Questionnaire-9 (PHQ-9), and all-cause mortality in adults aged 65 and older.Data Collection and Processing<b>Population</b>: 8,098 U.S. adults aged ≥65 years<b>Data Collection Period</b>: 2005-2018 (baseline), mortality follow-up until 2019<b>Median Follow-up</b>: 73 monthsKey Variables<b>Dependent Variable</b>:All-cause mortality statusSurvival time<b>Primary Independent Variable</b>:PHQ-9 Depressive Symptom Scores<b>Covariates</b>:Demographic Factors:AgeSexRaceEducation LevelMarital StatusHealth-Related Factors:Body Mass Index (BMI)Smoking StatusAntidepressant UseMajor Depressive Disorder (MDD) StatusAnalytical ApproachWeighted Cox regression modelsPiecewise regression analysisAdditive Cox model with smoothed curve fittingKey Findings<b>Males</b>: J-shaped mortality risk curveThreshold at PHQ-9 = 6Sharp mortality risk increase for scores ≤6No significant risk increase for scores &gt;6<b>Females</b>: Linear dose-response relationshipConsistent mortality risk increase across PHQ-9 scoresUsage NotesDesigned for research on geriatric mental health and mortalityWeights provided for national representativenessConsult original publication for full methodological detailsLimitationsObservational study designSelf-reported depressive symptomsPotential unmeasured confounding factorsLicensing and AttributionPlease cite the original study when using this dataset in research or publications.