Table 9 Multiple linear regression analysis of correlations between video characteristics and VPI, JAMA, mDISCERN, GQS, NPSS scores

VPI (R² = 0.624)

 Number of comments

0.583

0.105

0.374 – 0.791

0.549

< 0.001

 Uploader verification

122.362

56.786

9.579 – 235.144

0.213

0.034

 Sum of subscribers (× 10^–3)

-0.061

0.023

-0.107—-0.014

-0.272

0.011

 Video content

  CS-specific information

Ref

  Exercise training

164.943

57.479

50.784 – 279.103

0.293

0.005

JAMA (R² = 0.526)

 Video duration (× 10^–3)

0.295

0.063

0.170 – 0.419

0.378

< 0.001

 Like ratio

0.045

0.012

0.021 – 0.070

0.290

< 0.001

 Uploader verification

0.597

0.189

0.221 – 0.973

0.270

0.002

 Video source

  Medical source

Ref

  Academic

0.609

0.199

0.213 – 1.005

0.269

0.003

mDISCERN (R² = 0.549)

 Video duration (× 10^–3)

0.336

0.082

0.174 – 0.498

0.316

< 0.001

 Like ratio

0.063

0.016

0.031 – 0.095

0.295

< 0.001

 Video source

  Medical source

Ref

  Academic

0.923

0.254

0.420 – 1.426

0.299

< 0.001

  Trainer

-1.504

0.440

-2.377—-0.631

-0.247

0.001

GQS (R² = 0.689)

 Video duration (× 10^–3)

0.604

0.074

0.456 – 0.751

0.607

< 0.001

 Video source

  Medical source

Ref

  Academic

0.730

0.216

0.300 – 1.159

0.253

0.001

  Clinician

0.689

0.214

0.263 – 1.114

0.233

0.002

 Video content

  CS-specific information

Ref

  Exercise training

-0.653

0.278

-1.205—-0.101

-0.236

0.021

  Advertisement

-0.668

0.251

-1.166—-0.169

-0.180

0.009

CSSS (R² = 0.673)

 Video duration (× 10^–3)

3.140

0.382

2.382 – 3.899

0.603

< 0.001

 Video source

  Medical source

Ref

  Academic

3.345

1.174

1.015 – 5.676

0.222

0.005

  Clinician

3.112

1.113

0.902 – 5.322

0.201

0.006

  Non-clinician

-2.412

1.052

-4.500—-0.324

-0.186

0.024

  Trainer

-4.657

2.152

-8.931—-0.384

-0.156

0.033