{"id":"W2909248124","doi":"10.2196/10418","title":"How Well iPhones Measure Steps in Free-Living Conditions: Cross-Sectional Validation Study","year":2019,"lang":"en","type":"article","venue":"JMIR mhealth and uhealth","topic":"Physical Activity and Health","field":"Medicine","cited_by":78,"is_retracted":false,"has_abstract":true,"ca_institutions":"","funders":"","keywords":"Pedometer; Smartphone app; Spearman's rank correlation coefficient; Waist; Medicine; Limits of agreement; Activity monitor; Physical activity; Statistics; Physical therapy; Mathematics; Computer science; Body mass index; Internal medicine","routes":{"ca_aff":false,"ca_fund":false,"ca_venue":true,"about_ca":false,"invisible_to_affiliation_only":true},"retraction":null,"screen":null,"direct_labels":[],"prediction":{"model_version":"codex-gemma-dda1882f352a","candidate_categories":[],"consensus_categories":[],"category_scores_codex":[0.000917743,0.0001807246,0.000484456,0.0002157588,0.0002471154,0.00007268201,0.00007984133,0.0001477447,0.0001061958],"category_scores_gemma":[0.0001085951,0.0001677511,0.00005052708,0.0003403659,0.00006497481,0.0004443168,0.00004487504,0.000615893,0.00005747733],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.0002765301,"about_ca_system_score_gemma":0.0005935563,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.0007311195,"about_ca_topic_score_gemma":0.0003955004,"domain_scores_codex":[0.9978811,0.0002330421,0.0003984036,0.0004776943,0.0004800751,0.0005297145],"domain_scores_gemma":[0.9986456,0.0002580617,0.0001874864,0.0003419026,0.0001168545,0.0004501043],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"observational","study_design_gemma":"observational","study_design_scores_codex":[0.000298191,0.002262173,0.9925849,0.001751799,0.00001382502,0.000005758317,0.0008401972,0.000005415469,0.0001015195,0.0007140437,0.0005013747,0.00092084],"study_design_scores_gemma":[0.002793866,0.001574675,0.9929175,0.0001861196,0.00001869953,0.00002785421,0.0007793637,0.0001324495,0.00001867375,0.0007675216,0.0006520461,0.0001312185],"study_design_candidate":"observational","study_design_consensus":"observational","genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.9915205,0.0003328992,0.00002325204,0.004985326,0.0004271453,0.001839213,0.00003772066,0.00007238951,0.0007616106],"genre_scores_gemma":[0.9972233,0.0001538225,0.00005862613,0.0008880976,0.0003914587,0.0001080303,0.00004285664,0.00002180651,0.001111962],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.005702896,"threshold_uncertainty_score":0.684069,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.08520706137414956,"score_gpt":0.406597133969036,"score_spread":0.3213900725948864,"validation_status":"score_only:v0-immature-baseline","note":"Baseline scores from an immature model (maturity gate not passed). Scores rank; they never assert a category."}}