B
Evidence Grade B
Graded
under review
Safe to Cite
Current
9.5%
9.5% -- review helpfulness increase for online product reviews (2026)
When digits were used to write numbers (vs words), people found reviews up to 9.5% more helpful.
- Up to 9.5%
Attribution:
View source
Lighthouse Research Team
Last verified:
·
How we verify data →
Source verified
Evidence graded
Value
9.5%
Unit
Percentage
Data Vintage
2026
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Ariyh (Science Says)
Primary
Tier B
https://app.sciencesays.com/archive?ref=benjaminach.fr&page=12 ↗
Source Article
Science Says
Original Research
Ariyh (Science Says)
· Original study ↗
Methodology
Research digest of academic marketing study; upper-bound effect reported
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
online product reviews: 9.5% review helpfulness increase. Source: Ariyh (Science Says) (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/digits-in-reviews-helpfulness-9-5
HTML Embed
<blockquote cite="https://lighthousedata.io/data/digits-in-reviews-helpfulness-9-5" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>9.5%</strong> -- review helpfulness increase for online product reviews<br><small>Source: Ariyh (Science Says) (2026) · <a href="https://lighthousedata.io/data/digits-in-reviews-helpfulness-9-5" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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