{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/united-states-national-library-of-medicine/main/json-schema/nlm-clinical-trial-schema.json",
  "title": "ClinicalTrials.gov Study",
  "description": "Schema for a clinical trial study record from the ClinicalTrials.gov API",
  "type": "object",
  "properties": {
    "nctId": {
      "type": "string",
      "description": "ClinicalTrials.gov NCT identifier",
      "pattern": "^NCT[0-9]{8}$"
    },
    "briefTitle": {
      "type": "string",
      "description": "Brief title of the clinical trial"
    },
    "officialTitle": {
      "type": "string",
      "description": "Full official title of the study"
    },
    "overallStatus": {
      "type": "string",
      "description": "Current overall recruitment status",
      "enum": [
        "RECRUITING",
        "ACTIVE_NOT_RECRUITING",
        "COMPLETED",
        "NOT_YET_RECRUITING",
        "SUSPENDED",
        "TERMINATED",
        "WITHDRAWN",
        "ENROLLING_BY_INVITATION",
        "AVAILABLE",
        "UNKNOWN"
      ]
    },
    "conditions": {
      "type": "array",
      "description": "Conditions or diseases being studied",
      "items": {"type": "string"}
    },
    "interventions": {
      "type": "array",
      "description": "Interventions or treatments being investigated",
      "items": {
        "type": "object",
        "properties": {
          "type": {"type": "string"},
          "name": {"type": "string"},
          "description": {"type": "string"}
        }
      }
    },
    "studyType": {
      "type": "string",
      "description": "Type of study",
      "enum": ["INTERVENTIONAL", "OBSERVATIONAL", "EXPANDED_ACCESS"]
    },
    "phases": {
      "type": "array",
      "description": "Clinical trial phases",
      "items": {
        "type": "string",
        "enum": ["EARLY_PHASE1", "PHASE1", "PHASE2", "PHASE3", "PHASE4", "NA"]
      }
    },
    "leadSponsor": {
      "type": "object",
      "description": "Primary sponsor of the trial",
      "properties": {
        "name": {"type": "string"},
        "class": {"type": "string"}
      }
    },
    "startDate": {
      "type": "string",
      "format": "date",
      "description": "Actual or anticipated start date"
    },
    "completionDate": {
      "type": "string",
      "format": "date",
      "description": "Actual or anticipated completion date"
    },
    "eligibilityCriteria": {
      "type": "string",
      "description": "Inclusion and exclusion criteria text"
    },
    "minimumAge": {
      "type": "string",
      "description": "Minimum age for eligibility"
    },
    "maximumAge": {
      "type": "string",
      "description": "Maximum age for eligibility"
    },
    "sex": {
      "type": "string",
      "description": "Eligible biological sex (ALL, FEMALE, MALE)",
      "enum": ["ALL", "FEMALE", "MALE"]
    },
    "enrollmentCount": {
      "type": "integer",
      "description": "Target enrollment count"
    },
    "locations": {
      "type": "array",
      "description": "Trial locations",
      "items": {
        "type": "object",
        "properties": {
          "facility": {"type": "string"},
          "city": {"type": "string"},
          "state": {"type": "string"},
          "country": {"type": "string"},
          "status": {"type": "string"}
        }
      }
    }
  },
  "required": ["nctId", "briefTitle", "overallStatus"]
}