B
Evidence Grade B
Graded
under review
Safe to Cite
Current
25%
25% -- conversion rate lift for B2C email subject line test version B (2026)
Attribution:
View source
Lighthouse Research Team
Last verified:
·
How we verify data →
Source verified
Evidence graded
Value
25%
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
Email Optimization Shop (Jeanne Jennings)
Primary
Tier B
https://emailopshop.com/why-open-rate-isnt-a-good-key-performance-indicator-for-subject-line-tests/ ↗
Source Article
Why Open Rate isn’t a Good Key Performance Indicator for Subject Line Tests - Email Optimization Shop by Jeanne Jennings
“We’re testing a subject line, so we’ll use open rate as our KPI, since the subject line impacts the open rate. Whichever version gets the highest open rate will also likely have the highest conversion rate or revenue-per-email, right?”
As an email marketing consultant and trainer, I hear this a lot…
Original Research
Email Optimization Shop (Jeanne Jennings)
· Original study ↗
Methodology
Statistically significant per author; single client case study
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
B2C email subject line test version B: 25% conversion rate lift. Source: Email Optimization Shop (Jeanne Jennings) (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/subject-line-test-conversion-lift-version-b
HTML Embed
<blockquote cite="https://lighthousedata.io/data/subject-line-test-conversion-lift-version-b" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>25%</strong> -- conversion rate lift for B2C email subject line test version B<br><small>Source: Email Optimization Shop (Jeanne Jennings) (2026) · <a href="https://lighthousedata.io/data/subject-line-test-conversion-lift-version-b" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
Share
Related Statistics
Use this data in your work
Copy the citation, embed the widget, or explore thousands more verified marketing statistics -- all free.