curl -X GET "https://api.omophub.com/v1/vocabularies/SNOMED/statistics?include_hierarchy_stats=true&include_domain_breakdown=true&include_mapping_stats=true" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json"

{
  "success": true,
  "data": {
    "vocabulary_id": "SNOMED",
    "vocabulary_name": "Systematized Nomenclature of Medicine Clinical Terms",
    "vocabulary_version": "2024.2",
    "analysis_date": "2024-01-15T10:30:00Z",
    "concept_statistics": {
      "total_concepts": 354652,
      "standard_concepts": 298456,
      "classification_concepts": 56196,
      "non_standard_concepts": 0,
      "invalid_concepts": 1247,
      "concept_growth_rate": 2.8
    },
    "hierarchy_statistics": {
      "max_hierarchy_depth": 15,
      "average_depth": 6.8,
      "root_concepts": 19,
      "leaf_concepts": 187432,
      "depth_distribution": [
        { "depth": 1, "concept_count": 19 },
        { "depth": 2, "concept_count": 156 },
        { "depth": 3, "concept_count": 1247 },
        { "depth": 4, "concept_count": 8934 },
        { "depth": 5, "concept_count": 23567 },
        { "depth": 6, "concept_count": 45123 },
        { "depth": 7, "concept_count": 67834 },
        { "depth": 8, "concept_count": 89456 },
        { "depth": 9, "concept_count": 67234 },
        { "depth": 10, "concept_count": 34567 },
        { "depth": 11, "concept_count": 12345 },
        { "depth": 12, "concept_count": 3456 },
        { "depth": 13, "concept_count": 567 },
        { "depth": 14, "concept_count": 123 },
        { "depth": 15, "concept_count": 24 }
      ]
    },
    "domain_statistics": {
      "domains_covered": 18,
      "domain_distribution": [
        {
          "domain_id": "Condition",
          "domain_name": "Condition",
          "concept_count": 125643,
          "percentage": 35.4
        },
        {
          "domain_id": "Procedure",
          "domain_name": "Procedure",
          "concept_count": 87321,
          "percentage": 24.6
        },
        {
          "domain_id": "Observation",
          "domain_name": "Observation",
          "concept_count": 65432,
          "percentage": 18.4
        },
        {
          "domain_id": "Measurement",
          "domain_name": "Measurement",
          "concept_count": 34567,
          "percentage": 9.7
        },
        {
          "domain_id": "Drug",
          "domain_name": "Drug",
          "concept_count": 23456,
          "percentage": 6.6
        }
      ]
    },
    "concept_class_statistics": {
      "total_concept_classes": 24,
      "class_distribution": [
        {
          "concept_class_id": "Clinical Finding",
          "concept_count": 89567,
          "percentage": 25.3
        },
        {
          "concept_class_id": "Procedure",
          "concept_count": 67432,
          "percentage": 19.0
        },
        {
          "concept_class_id": "Body Structure",
          "concept_count": 45678,
          "percentage": 12.9
        }
      ]
    },
    "relationship_statistics": {
      "total_relationships": 1247832,
      "unique_relationship_types": 15,
      "relationship_type_distribution": [
        {
          "relationship_id": "Is a",
          "relationship_name": "Is a",
          "count": 567834,
          "percentage": 45.5
        },
        {
          "relationship_id": "Finding site",
          "relationship_name": "Finding site",
          "count": 123456,
          "percentage": 9.9
        },
        {
          "relationship_id": "Procedure site",
          "relationship_name": "Procedure site",
          "count": 98765,
          "percentage": 7.9
        }
      ]
    },
    "mapping_statistics": {
      "mapped_concepts": 298456,
      "unmapped_concepts": 56196,
      "mapping_coverage_percentage": 84.1,
      "target_vocabularies": [
        {
          "target_vocabulary_id": "ICD10CM",
          "mapping_count": 89456,
          "coverage_percentage": 25.2
        },
        {
          "target_vocabulary_id": "ICD10",
          "mapping_count": 67234,
          "coverage_percentage": 19.0
        },
        {
          "target_vocabulary_id": "LOINC",
          "mapping_count": 34567,
          "coverage_percentage": 9.7
        }
      ]
    },
    "language_statistics": {
      "supported_languages": ["en-US", "en-GB", "es-ES", "fr-FR", "de-DE"],
      "primary_language": "en-US",
      "multilingual_concepts": 234567
    },
    "quality_metrics": {
      "completeness_score": 94.2,
      "consistency_score": 97.8,
      "accuracy_indicators": {
        "orphaned_concepts": 234,
        "duplicate_codes": 12,
        "missing_descriptions": 89
      }
    },
    "trend_data": [
      {
        "period": "2024-Q1",
        "total_concepts": 354652,
        "concepts_added": 2847,
        "concepts_modified": 1523,
        "concepts_deprecated": 89
      },
      {
        "period": "2023-Q4",
        "total_concepts": 351805,
        "concepts_added": 1967,
        "concepts_modified": 2134,
        "concepts_deprecated": 156
      }
    ]
  },
  "meta": {
    "request_id": "req_snomed_stats_123",
    "timestamp": "2024-01-15T10:30:00Z",
    "computation_time_ms": 2847,
    "vocab_release": "2025.2"
  }
}