Did You Know That Three In Ten People Have Had Sleep Paralysis?

Researchers Pooled 76 Studies To Reach That Number

They Asked People Whether An Episode Had Ever Happened

One Episode At Any Point In A Life Was Enough To Count

The People Surveyed Were Not All Patients In A Clinic

Rates Differed Sharply Between The Groups They Surveyed

Even Within One Group The Studies Reported Different Rates

Researchers Publish A Range Beside The Three In Ten

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OKAY BACK FROM THE POOLED DATA 🗂️

A Meta-Analysis Pulled Together Every Available Prevalence Study

It Combined 76 Separate Studies On Sleep Paralysis

Those Studies Were Conducted Across 25 Countries

Together They Included 167,133 Participants In Total

The Researchers Combined Those Results Into One Estimate

Global Prevalence Of An Episode Came Out Near 30 Percent

That Estimate Runs Between A Low Of 22 And A High Of 39 Percent

A Confidence Interval Is A Range Not A Single Point

The True Population Rate Likely Falls Somewhere Inside That Range

Thirty Percent Is The Midpoint Not A Fixed Count Of Cases

About Three In Ten People Report An Episode At Some Point

Those Studies Asked About A Lifetime Not A Single Year

A Pooled Estimate Combines Studies That Used Different Methods

Sample Sizes And Survey Wording Varied From Study To Study

The Analysis Did Not Break Prevalence Down By Individual Country

No Single Country Was Named As Having The Highest Rate

That Detail Was Simply Left Out Of The Published Abstract

The 30 Percent Figure Covers All 76 Studies Together

The Same Meta-Analysis Broke Prevalence Down By Population Type

Psychiatric Patients Reported An Episode At 35 Percent

That Estimate Runs Between 20 And 55 Percent

Students Reported An Episode At 34 Percent

Their Estimate Runs Between 23 And 47 Percent

Both Figures Are Higher Than The 30 Percent Pooled Estimate

Neither One Explains Why That Rate Is Higher In That Group

The Abstract States The Pattern Without Naming A Cause

Students Have Been Counted Outside That Review As Well

One Study Surveyed 635 Students At A Single Japanese University

Roughly 40 Percent Said They Had Experienced An Episode

That Was Also A Lifetime Question Not A Yearly One

It Is Higher Than The Pooled Estimate And The Student Subgroup

One University Sample Cannot Represent Every Student Population

It Still Points In The Same Direction As The Pooled Student Data

Psychiatric Patients And Students Are The Only Two Groups Named

The Review Gives No Breakdown For Any Other Population

Every Other Group Is Covered By The 30 Percent Global Estimate

Individual Studies Feeding Into The Pooled Figure Varied Enormously

One Study Reported A Rate As Low As 2 Percent

Another Study Reported A Rate As High As 60 Percent

That Gap Does Not Appear In The Single 30 Percent Estimate

Researchers Summarise That Variation As A Value Called I Squared

The Pooled Estimate Itself Had An I Squared Of 100 Percent

That Number Describes Variation That Is Not Due To Chance

A High Value Means The Studies Are Not All Measuring One Thing

Researchers Say That Spread Likely Reflects Differing Diagnostic Tools

Some Samples Were Students And Others Were Psychiatric Patients

That Mix Of Sample Types Widens The Difference Between Studies

A Wide Confidence Interval Is A Warning Not A Weakness To Hide

It Tells A Reader The Number Is Built From Uneven Parts

A Single Study Reporting Something Near 2 Or 60 Percent Is An Outlier

The Pooled 30 Percent Remains The Best Global Summary Available

It Should Be Read As A Wide Range Not A Precise Count

The Review Also Detected Publication Bias Among Its Studies

For Now Three In Ten Is The Closest Global Estimate On Record