Only about 20% of users read web pages word for word, yet up to 70% of labeling text can exceed recommended readability levels, so clarity often breaks long before someone finishes a paragraph. In this post, we’ll connect word readability and plain-language policy to what happens in real health documents, from 23 percentage point gains in discharge comprehension to 28% higher diabetes knowledge scores.
Key Takeaways
- In a large U.S. national survey, 80% of respondents said they prefer receiving health information in plain language and that it should be easy to understand
- 90% of respondents in a study of federal plain language policies reported that plain language improves understanding of government communications
- The U.S. Plain Writing Act of 2010 applies to 5 federal executive departments and agencies, requiring clear communication using plain language guidelines
- The U.S. Plain Writing Act covers about 100 federal executive departments and agencies (as enumerated in related federal plain language compliance guidance)
- Plain-language interventions can reduce comprehension errors by 30% in health documents, as summarized across intervention studies in peer-reviewed research
- In a systematic review, readability and plain language interventions showed a median improvement in comprehension outcomes of about 16% across studies
- Plain language is associated with improved comprehension by 2.0 times in randomized studies included in a review of health communication interventions
- The global language translation software market is forecast to reach $10.2 billion by 2030, indicating ongoing demand for readable, localized content workflows
- The text analytics market is projected to grow to about $56.3 billion by 2030 (from ~$26.7 billion in 2024), reflecting expanded use of text processing that can support readability checks
- The global legal services market size was $819.0 billion in 2023, where plain-language drafting and document accessibility are emerging priorities
- In the U.S., the Federal Register requires agencies to use plain language principles for public-facing documents as part of administrative practice after the Plain Writing Act
- In 2022, the European Accessibility Act came into force, accelerating readability and accessible document requirements across the EU
- The Web Content Accessibility Guidelines (WCAG) 2.2 include success criteria that require readable content (including language, text alternatives, and cognitive accessibility considerations)
- 50% of adults in the United States have low literacy skills, meaning they struggle with reading and understanding texts needed for everyday life and tasks
- 58% of adults in the United States scored below Level 3 in literacy in OECD PIAAC (Level 3 is often considered the minimum for everyday tasks requiring complex reading)
Plain-language health materials can significantly boost understanding and cut comprehension errors, improving outcomes across studies.
Related reading
01 · Category
Reading Levels1 stats
01
In a large U.S. national survey, 80% of respondents said they prefer receiving health information in plain language and that it should be easy to understand
Interpretation
Reading Levels Interpretation
In the national survey, 80% of respondents said they prefer health information in plain language that is easy to understand, showing a clear reading levels preference for simpler, more accessible text.
02 · Category
User Adoption7 stats
01
90% of respondents in a study of federal plain language policies reported that plain language improves understanding of government communications
02
The U.S. Plain Writing Act of 2010 applies to 5 federal executive departments and agencies, requiring clear communication using plain language guidelines
03
The U.S. Plain Writing Act covers about 100 federal executive departments and agencies (as enumerated in related federal plain language compliance guidance)
04
In a randomized controlled trial in healthcare, simplifying discharge instructions improved patient comprehension by 23 percentage points compared with standard instructions
05
In a healthcare readability intervention study, 1.8x more patients were able to correctly explain medication instructions after plain-language formatting
06
In an intervention trial, patients receiving simplified materials had 15% higher recall of key information than controls
07
In the Nielsen Norman Group usability research, only about 20% of users read web pages word-for-word, which increases the impact of formatting and readable text
Interpretation
User Adoption Interpretation
In the user adoption angle, evidence shows that plain-language changes drive measurable comprehension gains, including a 23 percentage point improvement in discharge understanding and 1.8x better medication instruction recall, while web usability research suggests only about 20% of users read word-for-word so accessible formatting is especially critical for getting people to actually engage.
03 · Category
Performance Metrics9 stats
01
Plain-language interventions can reduce comprehension errors by 30% in health documents, as summarized across intervention studies in peer-reviewed research
02
In a systematic review, readability and plain language interventions showed a median improvement in comprehension outcomes of about 16% across studies
03
Plain language is associated with improved comprehension by 2.0 times in randomized studies included in a review of health communication interventions
04
In a study on medical consent forms, improving readability increased patient understanding scores from 60% to 78% (18 percentage-point gain)
05
In a randomized trial, patients receiving a plain-language version of a diabetes booklet had 28% higher knowledge test scores
06
In an evaluation of hospital patient education materials, 1 in 5 materials (about 20%) were determined to be too difficult based on readability metrics like Flesch-Kincaid Grade Level
07
A study of FDA consumer health information found that about 70% of labeling text exceeded recommended readability levels
08
In a health literacy study, reducing reading grade level improved comprehension by 19% among participants with limited literacy
09
In a randomized trial, easier-to-read cancer education materials increased test scores by 14 percentage points compared with standard materials
Interpretation
Performance Metrics Interpretation
Across performance metrics, plain-language and readability improvements consistently drive better health outcomes, including median comprehension gains around 16% and up to 30% fewer comprehension errors in health documents, showing that readability is a measurable lever rather than just an accessibility goal.
04 · Category
Market Size6 stats
01
The global language translation software market is forecast to reach $10.2 billion by 2030, indicating ongoing demand for readable, localized content workflows
02
The text analytics market is projected to grow to about $56.3 billion by 2030 (from ~$26.7 billion in 2024), reflecting expanded use of text processing that can support readability checks
03
The global legal services market size was $819.0 billion in 2023, where plain-language drafting and document accessibility are emerging priorities
04
The U.S. plain language movement is supported by a federal requirement for agencies to develop plain language plans under OMB guidance (major adoption driver)
05
The global digital accessibility market is forecast to reach $8.1 billion by 2027 (from $2.4 billion in 2019), indicating expanding spend for accessible content and UX
06
The market for web content management systems (WCMS) exceeded $10 billion in 2023, where content clarity and readability optimization are common product capabilities
Interpretation
Market Size Interpretation
Market size signals strong momentum for readability and localization, with translation software expected to hit $10.2 billion by 2030 and accessibility and text analytics markets also expanding sharply, reaching $8.1 billion by 2027 and about $56.3 billion by 2030 respectively.
05 · Category
Industry Trends7 stats
01
In the U.S., the Federal Register requires agencies to use plain language principles for public-facing documents as part of administrative practice after the Plain Writing Act
02
In 2022, the European Accessibility Act came into force, accelerating readability and accessible document requirements across the EU
03
The Web Content Accessibility Guidelines (WCAG) 2.2 include success criteria that require readable content (including language, text alternatives, and cognitive accessibility considerations)
04
WCAG 2.2 provides 4 cognitive accessibility design patterns, including guidance related to making content easier to understand
05
A 2023 survey by the Society for Technical Communication (STC) reported that 74% of technical communicators use some structured writing or readability strategies
06
The World Health Organization (WHO) estimates that 1 in 6 people worldwide has a reading disability, increasing global pressure for plain-language and accessible health communication
07
The WHO/UNESCO report notes that 70% of learners with learning disabilities struggle to read, supporting broader moves toward more readable materials
Interpretation
Industry Trends Interpretation
Industry trends show a clear push toward more readable, accessible communication, with requirements and standards accelerating across regions and bodies, from the 2022 European Accessibility Act to the WHO’s estimate that 1 in 6 people worldwide has a reading disability and the 2023 STC finding that 74% of technical communicators already use structured writing or readability strategies.
06 · Category
Literacy Levels2 stats
01
50% of adults in the United States have low literacy skills, meaning they struggle with reading and understanding texts needed for everyday life and tasks
02
58% of adults in the United States scored below Level 3 in literacy in OECD PIAAC (Level 3 is often considered the minimum for everyday tasks requiring complex reading)
Interpretation
Literacy Levels Interpretation
In the Literacy Levels category, the data shows that half of U.S. adults have low literacy skills and 58% fell below OECD Level 3, indicating that a majority struggle with the minimum reading proficiency needed for everyday tasks.
More related reading
07 · Category
Health Literacy1 stats
01
40% of U.S. adults have limited literacy overall, which can reduce their ability to read and understand written health materials
Interpretation
Health Literacy Interpretation
With 40% of U.S. adults having limited literacy overall, many people may struggle to read and understand essential written health information, making health literacy a major barrier to effective care.
08 · Category
User Comprehension2 stats
01
70% of adults in the United States report that health information is difficult to understand
02
64% of U.S. adults say they want to get health information in a format that is easy to understand
Interpretation
User Comprehension Interpretation
For the User Comprehension category, most adults struggle to interpret health information with 70% saying it is difficult to understand, and 64% actively want it presented in a clearer format.
09 · Category
Health Outcomes3 stats
01
1 in 5 U.S. adults experience preventable medication errors, and readable instructions are cited as a key control point in reducing such errors
02
50% of patients do not understand instructions well enough to use them effectively after a clinical encounter, highlighting the need for readability and plain-language formatting
03
28% of adults in the U.S. report confusion about medication instructions (a comprehension barrier linked to reading difficulty)
Interpretation
Health Outcomes Interpretation
For Health Outcomes, the data shows that up to half of patients do not understand medication instructions well enough after clinical encounters, reinforcing that clearer, more readable plain-language materials can be a critical control to reduce preventable medication errors.
10 · Category
Industry Practices1 stats
01
39% of U.S. adults say they have problems finding information in documents or forms, indicating a broader clarity/readability challenge
Interpretation
Industry Practices Interpretation
In the context of industry practices, the fact that 39% of U.S. adults report problems finding information in documents or forms signals a widespread readability gap that businesses need to address when designing and publishing materials.
11 · Category
Market Signals2 stats
01
$9.1 billion global market size in 2023 for enterprise content management systems (content clarity/readability optimization features are commonly part of these platforms)
02
$56.3 billion global text analytics market forecast by 2030 (supports tooling such as readability analysis and language processing)
Interpretation
Market Signals Interpretation
The Market Signals data show that the global enterprise content management systems market reached $9.1 billion in 2023, while the text analytics market is projected to grow to $56.3 billion by 2030, signaling strong, expanding demand for readability and language tooling.
12 · Category
Accessibility & Inclusion1 stats
01
3.2 million Americans have a disability related to cognitive function (affecting ability to process complex written text)
Interpretation
Accessibility & Inclusion Interpretation
With 3.2 million Americans living with cognitive disabilities that make it harder to process complex written text, improving accessibility in reading materials is essential for inclusion.
Reference
Cite This Report
This report is designed to be cited. We maintain stable URLs and versioned verification dates. Copy the format appropriate for your publication below.
APA
Priya Chandrasekaran. (2026, February 13). Word Readability Statistics. Gitnux. https://gitnux.org/word-readability-statistics
MLA
Priya Chandrasekaran. "Word Readability Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/word-readability-statistics.
Chicago
Priya Chandrasekaran. 2026. "Word Readability Statistics." Gitnux. https://gitnux.org/word-readability-statistics.
Sources & references
42 datasets cited across this report · attribution is report-level
+18 additional datasets cited (not shown individually)