Metric,Value,Unit,Date,Methodology_Notes,Primary_Source,Source_URL,Confidence_Tier
AIO Query Prevalence (BrightEdge 9-industry tracker),48,% of tracked queries,February 2026,"9-industry keyword panel; not representative of all query types",BrightEdge Research,brightedge.com,Tier 3
AIO Query Prevalence (Semrush — January 2025 baseline),6.49,% of tracked queries,January 2025,"10M+ keyword tracking panel",Semrush,semrush.com,Tier 3
AIO Query Prevalence (Semrush — peak),24.61,% of tracked queries,July 2025,"10M+ keyword tracking panel — peak reading before normalization",Semrush,semrush.com,Tier 3
AIO Query Prevalence (Semrush — November 2025),15.69,% of tracked queries,November 2025,"10M+ keyword tracking panel — post-peak normalization",Semrush,semrush.com,Tier 3
AIO Query Prevalence (Conductor),25,% of tracked queries,Q1 2026,"21.9 million mixed-intent query analysis",Conductor,conductor.com,Tier 3
AIO Query Prevalence (AdvancedWebRanking / Xponent21),60-65,% of tracked queries,April 2026,"Informational-heavy query set; highest reading in literature",AdvancedWebRanking / Xponent21,advancedwebranking.com,Tier 3
AIO Query Prevalence (Google self-reported),~50,% of queries,February 2026,"No methodology disclosed by Google",Google official / Marketech APAC,,N/A
AIO Query Prevalence (SE Ranking),59.73,% of tracked queries,February 2026,"1M keyword panel — post-Gemini 3 rollout",SE Ranking,seranking.com,Tier 3
AIO Query Prevalence (Safari Digital — conservative),21,% of tracked queries,2026,"Conservative non-branded mixed query set",Safari Digital,safaridigital.com.au,Tier 3
AIO Monthly Active Users,2000000000,users,July 2025,"Google official disclosure; confirmed at July 2025",Google / Alphabet Earnings,abc.xyz,N/A
AIO Countries Available,200+,countries,May 2025,"Google official expansion announcement — May 2025",Google Search Central,blog.google,N/A
AIO Languages Available,40+,languages,May 2025,"Google official expansion announcement",Google Search Central,blog.google,N/A
Organic CTR on AIO-present queries (Seer — September 2025),0.61,%,September 2025,"25.1M organic impressions; 1.1M paid impressions; 42 organizations; June 2024–September 2025",Seer Interactive,seerinteractive.com,Tier 1
Organic CTR on non-AIO queries (Seer — September 2025),1.76,%,September 2025,"Same Seer panel — comparison baseline",Seer Interactive,seerinteractive.com,Tier 1
CTR decline when AIO present (Seer),65,% decline,September 2025,"From 1.76% to 0.61%",Seer Interactive,seerinteractive.com,Tier 1
Organic CTR on AIO-present queries (Seer — February 2026 rebound),2.4,%,February 2026,"Seer 2026 update; same methodology; partial rebound from December 2025 floor of 1.3%",Seer Interactive,seerinteractive.com,Tier 1
Organic CTR floor (Seer — December 2025),1.3,%,December 2025,"Seer 2026 update — lowest point observed",Seer Interactive,seerinteractive.com,Tier 1
User click rate on AIO-present SERP — organic results (Pew),8,% of search visits,March 2025 (data),"68,879 tracked Google searches from 900 U.S. adults behavioral panel; Pew KnowledgePanel Digital",Pew Research Center,pewresearch.org,Tier 1
User click rate on non-AIO SERP — organic results (Pew),15,% of search visits,March 2025 (data),"Same Pew behavioral panel — comparison baseline",Pew Research Center,pewresearch.org,Tier 1
User click rate on AIO citation links (Pew),1,% of search visits,March 2025 (data),"Same Pew behavioral panel — clicks specifically on links inside the AI Overview",Pew Research Center,pewresearch.org,Tier 1
Pew study: % of U.S. Google users who encountered AIO in March 2025,58,% of panel who searched Google,March 2025 (data); published July 2025,"900-person behavioral panel; 68,879 tracked searches",Pew Research Center,pewresearch.org,Tier 1
Pew study: Sessions ending entirely without any click (AIO-present),26,% of sessions,March 2025 (data),"Pew behavioral panel — 'search session ended' metric",Pew Research Center,pewresearch.org,Tier 1
Pew study: Sessions ending entirely without any click (no AIO),16,% of sessions,March 2025 (data),"Same Pew panel — comparison for non-AIO sessions",Pew Research Center,pewresearch.org,Tier 1
Position 1 CTR with AIO (Ahrefs — December 2025),1.6,%,December 2025,"300,000-keyword Google Search Console comparison: December 2023 baseline vs December 2025",Ahrefs,ahrefs.com,Tier 2
Position 1 CTR without AIO — informational queries (Ahrefs baseline),7.3,%,December 2023 (baseline),"Same Ahrefs 300K keyword study — pre-AIO baseline for same query types",Ahrefs,ahrefs.com,Tier 2
Position 1 CTR decline attributed to AIO (Ahrefs),58,% decline,February 2026,"Ahrefs controlled comparison: 7.3% → 1.6%; controlling for general trend",Ahrefs,ahrefs.com,Tier 2
Position 1 CTR — informational queries without AIO (Dec 2025),3.9,%,December 2025,"General trend decline even without AIO present — Ahrefs same study",Ahrefs,ahrefs.com,Tier 2
Position 1 CTR Germany: with AIO (Sistrix),11,%,February 2026,"German SERP analysis post-March 26 2025 German AIO rollout",Sistrix,sistrix.com,Tier 3
Position 1 CTR Germany: without AIO (Sistrix),27,%,February 2026,"Same Sistrix German SERP analysis",Sistrix,sistrix.com,Tier 3
Citation CTR premium — organic (cited vs uncited on same SERP),120,% lift per impression,2026,"Seer Interactive 2026 update; 53 brands; 5.47M tracked queries",Seer Interactive,seerinteractive.com,Tier 1
Citation CTR premium — organic clicks (cited vs uncited),35,% more organic clicks,2026,"Seer Interactive 2026 update",Seer Interactive,seerinteractive.com,Tier 1
Citation CTR premium — paid clicks (cited vs uncited),91,% more paid clicks,2026,"Seer Interactive 2026 update",Seer Interactive,seerinteractive.com,Tier 1
Branded queries with AIO — CTR change vs without AIO,+18.68,% CTR change,2025,"Amsive 700,000-keyword study across 10 websites and 5 industries",Amsive,amsive.com,Tier 2
Non-branded queries with AIO — CTR change vs without AIO,-19.98,% CTR change,2025,"Same Amsive 700K keyword study",Amsive,amsive.com,Tier 2
Zero-click rate — all Google searches (SparkToro 2019),~50,% of searches,2019,"SparkToro historical baseline — earliest systematic measurement",SparkToro,sparktoro.com,Tier 2
Zero-click rate — all Google searches (SparkToro/Datos 2021),64.82,% of searches,2021,"SparkToro / Datos clickstream panel — post-PAA expansion",SparkToro / Datos,sparktoro.com,Tier 2
Zero-click rate — all Google searches (SparkToro/Datos 2024 US),58.5,% of searches,2024,"SparkToro / Datos clickstream — methodology note: 2022–2024 lower due to panel methodology change",SparkToro / Datos,sparktoro.com,Tier 2
Zero-click rate — all Google searches (SparkToro/Datos 2024 EU),59.7,% of searches,2024,"SparkToro / Datos European clickstream panel",SparkToro / Datos,sparktoro.com,Tier 2
Zero-click rate — all Google searches (estimated 2026),~65,% of searches,2026,"SparkToro / Datos 2026 estimate — provisional",SparkToro / Datos,sparktoro.com,Tier 2
Zero-click rate — AIO-present queries,83,% of sessions,August 2025,"SparkToro/Datos clickstream panel for AIO-triggered queries",SparkToro / Datos,sparktoro.com,Tier 2
Zero-click rate — Google AI Mode sessions,93,% of sessions,September 2025,"Semrush analysis of AI Mode user sessions",Semrush,semrush.com,Tier 3
Zero-click rate — traditional Google (no AIO present),60,% of sessions,February 2025,"Bain & Company analysis",Bain & Company,bain.com,Tier 3
AIO trigger rate — health/medical queries,51.6,% of queries,March 2026,"Stackmatix vertical analysis",Stackmatix,stackmatix.com,Tier 3
AIO trigger rate — relationship/lifestyle queries,54.84,% of queries,2025,"SE Ranking vertical analysis",SE Ranking,seranking.com,Tier 3
AIO trigger rate — e-commerce/transactional queries,3.2-4,% of queries,2025-2026,"SE Ranking / Ahrefs November 2025",SE Ranking / Ahrefs,seranking.com,Tier 3
AIO trigger rate — informational/educational queries,55-65,% of queries,2026,"BrightEdge informational query tracking",BrightEdge Research,brightedge.com,Tier 3
AIO citation overlap with organic top-10 (mid-2025),76,% of citations from top-10,mid-2025,"Ahrefs / ALM Corp early measurement",Ahrefs / ALM Corp,ahrefs.com,Tier 2
AIO citation overlap with organic top-10 (early 2026),17-54,% of citations from top-10,early 2026,"Range across studies: Ahrefs / ALM Corp March 2026; methodology-dependent",Ahrefs / ALM Corp,ahrefs.com,Tier 2
% of AIO sources from organic top-10 (SeoClarity),99.5,% of AIO citations,2025,"SeoClarity analysis — note: distinct from overlap study above (measures which rank AIO sources hold, not whether top-10 pages are cited)",SeoClarity,seoclarity.net,Tier 3
Average citations per AI Overview (Digital Applied 1K AIO study),4.2,citations per AIO,April 2026,"Digital Applied: 1,000 AIO sample; 10 query intents; ~30 verticals",Digital Applied,digitalapplied.com,Tier 2
Median age of cited page in AIO,14,months,April 2026,"Digital Applied: 1,000 AIO sample",Digital Applied,digitalapplied.com,Tier 2
Schema markup citation lift (Digital Applied),2.3,x more likely to be cited,April 2026,"Digital Applied: 1,000 AIO sample; page-level signal analysis",Digital Applied,digitalapplied.com,Tier 2
FAQ + HowTo + Article schema citation lift (eSEOspace),2.5-3,x citation rate vs no schema,2026,"eSEOspace client data analysis",eSEOspace,eseospace.com,Tier 3
Top 1% cited domains share of all citations,47,% of all AIO citations,April 2026,"Digital Applied: 1,000 AIO sample",Digital Applied,digitalapplied.com,Tier 2
AIO citation share — Reddit (Google AIO specifically),21,% of AIO citations,2025-2026,"Aggregated from Profound, SE Ranking, Ahrefs tracking",Profound / SE Ranking / Ahrefs,,Tier 3
Reddit AIO citation growth (March–June 2025),450,% growth,March–June 2025,"Digital Bloom analysis of Reddit AIO citation tracking",Digital Bloom,thedigitalbloom.com,Tier 3
Share of AI social citations — YouTube (OtterlyAI),31.8,% of AI social citations,April 2026,"OtterlyAI: 100M+ citation instance analysis",OtterlyAI,otterlyai.com,Tier 3
Share of AI social citations — Reddit (OtterlyAI),46.4,% of AI social citations,April 2026,"OtterlyAI: 100M+ citation instance analysis",OtterlyAI,otterlyai.com,Tier 3
AIO citations from article conclusions (last third of page),24.7,% of citations,February 2026,"Growth Memo analysis",Growth Memo,growthmemoranda.com,Tier 3
Google search referral traffic decline — publishers globally,33,% decline,Year to November 2025,"Reuters Institute / Chartbeat January 2026 multi-publisher report",Reuters Institute / Chartbeat,reutersinstitute.politics.ox.ac.uk,Tier 1
Google AI Mode users (December 2025),75000000,users,December 2025,"Google VP Nick Fox disclosure",Google (Nick Fox statement),,N/A
Google AI Mode users (early 2026),100000000+,users,Early 2026,"Google official",Google official,,N/A
AI Mode zero-click for transactional queries (CTR),69,% CTR for transactional,2026,"Quantumrun analysis of AI Mode session data",Quantumrun,quantumrun.com,Tier 3
Consumer fact-check rate on AIO/AI Mode content,68,% of consumers,2026,"Quantumrun consumer survey",Quantumrun,quantumrun.com,Tier 3
Gartner prediction: traditional search volume decline by 2026,25,% decline predicted,2024 (prediction),"Gartner research prediction",Gartner,gartner.com,Tier 3
ACLS — Axis Intelligence AIO Citation Leverage Score (cited position 5 estimated CTR),1.54,%,June 2026,"ORIGINAL AXIS INTELLIGENCE ANALYSIS: Derived from Seer Interactive citation premium (120% lift) applied to estimated position-5 base CTR (~0.7%) on AIO-present SERP. Inputs: Seer Interactive 2026 + Ahrefs December 2025. See methodology note.",Axis Intelligence Research,axis-intelligence.com,Original Analysis
ACLS — Uncited position 1 CTR on AIO-present SERP (Ahrefs input),1.6,%,December 2025,"Input data for ACLS comparison: Ahrefs February 2026 study",Ahrefs,ahrefs.com,Tier 2
Longer/complex queries AIO representation growth since May 2024,49,% growth,2026,"BrightEdge analysis of query complexity vs AIO trigger correlation",BrightEdge Research,brightedge.com,Tier 3
Overall click-through fall despite Google 90%+ search share,30,% overall CTR decline,2026,"BrightEdge 9-industry aggregate",BrightEdge Research,brightedge.com,Tier 3
Average AIO word count,169,words,2025-2026,"Advanced Web Ranking: 8,000 keyword AIO analysis",Advanced Web Ranking,advancedwebranking.com,Tier 3
Average AIO links when expanded,7,links,2025-2026,"Advanced Web Ranking: 8,000 keyword AIO analysis",Advanced Web Ranking,advancedwebranking.com,Tier 3
First organic result pixel depth on AIO-present SERP,1674,pixels below top of page,2025-2026,"Advanced Web Ranking measurement",Advanced Web Ranking,advancedwebranking.com,Tier 3
Google Gemini model powering AIO (as of January 27 2026),Gemini 3,model name,January 27 2026,"Google deployment announcement",Google,,N/A