{"schema":"diseasemaps.public-dataset","version":"1.0","dataset":"disease_symptoms","generatedAt":"2026-07-13T08:37:11+00:00","data":{"disease":{"slug":"visual-snow","name":"Visual Snow"},"reportingCohortSizeLowerBound":45,"editorialQuarter":"2026-Q2","symptoms":[{"slug":"ear-ringing---tinnitus","name":"Ear ringing \/ tinnitus","respondentCountLowerBound":15,"prevalencePercent":35,"severity":{"scale":{"min":0,"max":5,"higherIsMoreSevere":true},"nLowerBound":15,"mean":3.5}},{"slug":"vision-abnormalities-halos-floaters-snow","name":"Vision abnormalities (halos\/floaters\/snow)","respondentCountLowerBound":15,"prevalencePercent":35,"severity":{"scale":{"min":0,"max":5,"higherIsMoreSevere":true},"nLowerBound":15,"mean":4}},{"slug":"visual-disturbances-light-flashes-and-squiggles","name":"Visual disturbances (light flashes and squiggles)","respondentCountLowerBound":10,"prevalencePercent":20,"severity":{"scale":{"min":0,"max":5,"higherIsMoreSevere":true},"nLowerBound":10,"mean":3.5}}]},"methodology":{"minimumRespondentsPerSymptom":10,"publicCountBandSize":5,"publicValues":"Counts are lower bounds rounded down to groups of five, prevalence to five percentage points and mean severity to half a scale point. Severity is separately suppressed unless ten valid levels exist.","denominator":"Active users with at least one active symptom report explicitly scoped to this disease; the documented single-disease rule remains only for legacy rows.","deduplication":"One current report per person and symptom, selected by report date and then row order.","diseaseAssignment":"New reports store disease context directly. Legacy rows without that field are included only for people with exactly one active patient-disease marker, preventing a report from being copied into several cohorts.","prevalenceDefinition":"Respondents reporting the symptom divided by symptom-reporting respondents for this disease.","biasWarning":"This is a voluntary community sample and must not be interpreted as clinical or population prevalence.","releaseWindow":"Only completed calendar quarters are included; the public contract exposes an editorial quarter, never an exact contribution date.","personalData":"Cells below ten respondents are suppressed and published values are banded; no exact contribution date, user identifier, coordinate, email or free text is returned."},"license":{"name":"DiseaseMaps public API terms not yet specified","url":null,"notice":"Public access does not by itself grant an open-data licence. Contact DiseaseMaps before redistribution or commercial reuse."}}