{"citations":{"source_mix":{"company_owned":59,"independent":74,"unclear":10},"sources_referenced_by_questions":0,"support_mix":{"direct":100,"partial":33},"total_sources":143,"unique_domain_count":78},"claims":[{"claim_id":"claim-001","confidence":"verified","observed_at":"2026-09-27","platform_support":["anthropic","deepseek","google","grok","kimi","openai","perplexity"],"predicate":"platforms_analyzed","qualifier":"valid included platform responses","subject":"Best Perch Stairlifts for Narrow Stairs","unit":"platforms","value":7},{"claim_id":"claim-002","confidence":"verified","observed_at":"2026-09-27","platform_support":["deepseek","google","grok","kimi","perplexity"],"predicate":"final_consensus_rank","qualifier":"Perching Seat for Tight Staircases","subject":"Stannah Sadler","unit":"rank","value":1},{"claim_id":"claim-003","confidence":"verified","observed_at":"2026-09-27","platform_support":["deepseek","google","grok","kimi","perplexity"],"predicate":"platform_mentions","qualifier":"out of 7","subject":"Stannah Sadler","unit":"platforms","value":5},{"claim_id":"claim-004","confidence":"verified","observed_at":"2026-09-27","platform_support":["google","grok","kimi","openai","perplexity"],"predicate":"final_consensus_rank","qualifier":"Perching Seat for Tight Staircases","subject":"Handicare 1000 Perch","unit":"rank","value":2},{"claim_id":"claim-005","confidence":"verified","observed_at":"2026-09-27","platform_support":["google","grok","kimi","openai","perplexity"],"predicate":"platform_mentions","qualifier":"out of 7","subject":"Handicare 1000 Perch","unit":"platforms","value":5},{"claim_id":"claim-006","confidence":"verified","observed_at":"2026-09-27","platform_support":["anthropic","google"],"predicate":"final_consensus_rank","qualifier":"Perching Seat for Tight Staircases","subject":"Acorn 120 Perch","unit":"rank","value":3},{"claim_id":"claim-007","confidence":"verified","observed_at":"2026-09-27","platform_support":["anthropic","google"],"predicate":"platform_mentions","qualifier":"out of 7","subject":"Acorn 120 Perch","unit":"platforms","value":2},{"claim_id":"claim-008","confidence":"verified","observed_at":"2026-09-27","platform_support":["deepseek","kimi"],"predicate":"final_consensus_rank","qualifier":"Perching Seat for Tight Staircases","subject":"Bruno Elan Perch Stairlift","unit":"rank","value":4},{"claim_id":"claim-009","confidence":"verified","observed_at":"2026-09-27","platform_support":["deepseek","kimi"],"predicate":"platform_mentions","qualifier":"out of 7","subject":"Bruno Elan Perch Stairlift","unit":"platforms","value":2},{"claim_id":"claim-010","confidence":"verified","observed_at":"2026-09-27","platform_support":["google","kimi"],"predicate":"final_consensus_rank","qualifier":"Perching Seat for Tight Staircases","subject":"Harmar SL600 Pinnacle Premium","unit":"rank","value":5},{"claim_id":"claim-011","confidence":"verified","observed_at":"2026-09-27","platform_support":["google","kimi"],"predicate":"platform_mentions","qualifier":"out of 7","subject":"Harmar SL600 Pinnacle Premium","unit":"platforms","value":2}],"content_scope":"aggregated facts, computed metrics, and retrieval summaries","entities":[{"average_rank":1.4,"best_rank":1,"entity_id":"entity-001","entity_type":"company","final_rank":1,"name":"Stannah Sadler","platform_mentions":5,"platform_share":0.7142857142857143},{"average_rank":1.8,"best_rank":1,"entity_id":"entity-002","entity_type":"company","final_rank":2,"name":"Handicare 1000 Perch","platform_mentions":5,"platform_share":0.7142857142857143},{"average_rank":2,"best_rank":1,"entity_id":"entity-003","entity_type":"company","final_rank":3,"name":"Acorn 120 Perch","platform_mentions":2,"platform_share":0.2857142857142857},{"average_rank":3.5,"best_rank":3,"entity_id":"entity-004","entity_type":"company","final_rank":4,"name":"Bruno Elan Perch Stairlift","platform_mentions":2,"platform_share":0.2857142857142857},{"average_rank":3.5,"best_rank":3,"entity_id":"entity-005","entity_type":"company","final_rank":5,"name":"Harmar SL600 Pinnacle Premium","platform_mentions":2,"platform_share":0.2857142857142857}],"identity":{"dataset_url":"https://aginginplaceindex.com/datasets/stairlifts/perching-seat-for-tight-staircases.json","page_url":"https://aginginplaceindex.com/stairlifts/perching-seat-for-tight-staircases","report_type":"best_of_index","study_id":"AIPI-STUDY-4DCA0C1118D6","title":"Best Perch Stairlifts for Narrow Stairs (2026)"},"limitations":["Exactly 7 platforms were included in this run: openai, anthropic, deepseek, grok, perplexity, kimi, google. The configured source value 7 is provenance only and must never be described as the number of platforms studied.","The finalrankingtable is the sole authority for rank, platform mentions, platform share, average rank, and best rank. Ignore any conflicting value embedded in a entity evidence bundle.","The Consensus Ranking table must contain exactly one row per finalrankingtable entity, in that order, using that exact entityname. Never split one ranked entity into two product, model, SKU, or product-line rows, and never add another ranking row for a brand already listed. Put recommended products or plans inside that entity's ranked section.","Platform mentions count only ranking-discovery mentions. Do not substitute the number of platforms that later completed a fit assessment.","Citation IDs inside each entity bundle are local to that entity. Consolidate sources by URL using the supplied source catalog.","The URLs were collected from platform responses and were not independently validated by either writer stage.","Each fitreviewurlorplaceholder is the final site-relative CMS path for that entity's review. Link the entity name to that exact path exactly once in its ranked prose section, outside tables and headings. Never replace it with a run ID, report ID, UUID, or local output path.","Use the exact entity-namespaced citation IDs from the source catalog (e.g. e1:); never transfer a citation between entities."],"methodology":{"fit_rating_contract":["strong","good","mixed","weak","uncertain"],"included_valid_platform_count":7,"maximum_finalists":10,"minimum_mentions":2,"name":"Aging in Place Index cross-platform AI consensus analysis","platforms_included":["anthropic","deepseek","google","grok","kimi","openai","perplexity"],"platforms_queried":["openai","anthropic","deepseek","grok","perplexity","kimi","google"],"stages":["ranking_discovery","fit_assessment","normalization","editorial_synthesis"],"version":"alias-table-1"},"provenance":{"generated_at":"2026-09-27 14:35:38.995413+00","research_date":"2026-09-27","source_snapshot_sha256":"2374d77aec1feb4d3f10e1731ef9ff5a2315d3762b17f6b051d729e0d41f36f0","verification_scope":"public_verification"},"ranking":{"candidates_evaluated":8,"qualified_finalists":5,"ranking_unit":"Perch stairlift model and manufacturer"},"schema_version":4,"summary":"Stannah Sadler leads the September 2026 consensus ranking for Perching Seat for Tight Staircases, followed by Handicare 1000 Perch and Acorn 120 Perch. The current study includes 7 valid AI-platform responses and 5 qualifying entities. Compared with August 2026, the leader changed. The current list added Handicare 1000 Perch, Acorn 120 Perch, Bruno Elan Perch Stairlift, and Harmar SL600 Pinnacle Premium and removed AmeriGlide and Acorn 130 Sit/Stand. This is an immediately preceding-month comparison. Rank movement measures changes in this collection of standardized AI-platform responses. It…","target_buyer":"Homeowners with narrow staircases where a traditional seated stairlift would block access or create clearance issues","topic":{"base_category":"Stairlifts","category_criteria":["Minimum staircase width","perch seat angle","folded footprint","rail profile","knee clearance","swivel/parking options","safety sensors","installation requirements"],"geography":"United States","slug":"best-perch-stairlifts-for-narrow-stairs","title":"Best Perch Stairlifts for Narrow Stairs","use_case":"Perching Seat for Tight Staircases"}}