{
 "measured_on": "2026-08-06",
 "method": "Pages AI engines actually cited, taken from two existing 100-prompt probe runs (2026-08-02 and 2026-08-05) across ChatGPT, Perplexity, Gemini, Google AI Overviews and Google AI Mode. No new probe runs. Aggregators (YouTube, Reddit, social, app stores, Amazon) excluded. Heavy band (296 URLs cited 5+ times) taken whole; light band sampled to 400 at random seed 20260806. Fetch succeeded on 261 and 354.",
 "population": {
  "unique_cited_urls": 4149,
  "cited_5_plus": 296,
  "cited_once": 2670
 },
 "page_level": {
  "cited_5_plus": {
   "pages": 261,
   "faq_schema": 97,
   "faq_schema_pct": 37.2,
   "three_plus_question_headings": 170,
   "question_headings_pct": 65.1
  },
  "cited_once": {
   "pages": 354,
   "faq_schema": 99,
   "faq_schema_pct": 28.0,
   "three_plus_question_headings": 233,
   "question_headings_pct": 65.8
  }
 },
 "domain_level_one_page_per_domain": {
  "cited_5_plus": {
   "pages": 197,
   "faq_schema": 68,
   "faq_schema_pct": 34.5,
   "three_plus_question_headings": 128,
   "question_headings_pct": 65.0
  },
  "cited_once": {
   "pages": 305,
   "faq_schema": 87,
   "faq_schema_pct": 28.5,
   "three_plus_question_headings": 195,
   "question_headings_pct": 63.9
  }
 },
 "significance": {
  "faq_schema_page_level": {
   "z": 2.42,
   "p": 0.0155
  },
  "faq_schema_domain_level": {
   "z": 1.42,
   "p": 0.1558
  },
  "question_headings_page_level": {
   "z": -0.18,
   "p": 0.8598
  }
 },
 "headline": "FAQ schema looks associated with heavier citation at page level (37.2% vs 28.0%, p=0.016) but the difference is NOT significant once each publisher is counted once (34.5% vs 28.5%, p=0.156). Question-shaped headings show no difference at either level.",
 "caveat": "Observational. These are pages engines chose to cite; nothing here establishes causation."
}