Table 3 Univariable and multivariable linear regression-derived coefficients (B) and 95% confidence intervals (CIs), with overall quality score as the dependent variable for the included 182 abstracts

Journal

PD

Reference

Reference

IJPD

0.511

(-0.099, 1.121)

0.100

0.246

(-0.334, 0.826)

0.705

1.419

0.404

EJPD

-0.315

(-0.997, 0.368)

0.364

0.094

(-0.554, 0.741)

0.752

1.330

0.775

JOCPD

-0.063

(-0.641, 0.516)

0.831

0.285

(-0.265, 0.836)

0.683

1.465

0.307

EAPD

0.735

(0.177, 1.293)

0.010^b

0.503

(-0.028, 1.034)

0.669

1.494

0.063

Continent

North America

Reference

South America

0.175

(-0.769, 1.120)

0.714

Europe

0.080

(-0.847, 1.006)

0.865

Asia

0.412

(-0.620, 1.005)

0.614

Africa

0.532

(-0.573, 1.637)

0.343

Year

1 year

0.135

(0.037, 0.234)

0.007^b

0.041

(-0.055, 0.137)

0.885

1.130

0.403

Abstract word count

1 word

0.002

(-0.004, 0.007)

0.523

No. of author

1 author

-0.004

(-0.121, 0.112)

0.942

Sample size

1 participate

0.000

(0.000, 0.001)

0.046^b

0.000

(0.000, 0.001)

0.965

1.036

0.074

Treatment arms

2

Reference

3

-0.207

(-0.753, 0.338)

0.454

 > 3

-0.554

(-1.224, 0.117)

0.105

Multi-center

Yes

Reference

No

-0.457

(-1.393, 0.480)

0.337

Multiple affiliations

Yes

Reference

No

-0.457

(-1.044, 0.131)

0.127

Statistician involvement

Yes

Reference

No

-0.287

(-0.910, 0.336)

0.365

Reported use of CONSORT

Yes

Reference

No

-0.428

(-0.916, 0.059)

0.085

Use of flow diagram

Yes

Reference

Reference

No

-1.147

(-1.523, -0.772)

 < 0.001^b

-0.984

(-1.413, -0.556)

0.746

1.341

 < 0.001^b

Exact P-value

Yes

Reference

Reference

No

-0.504

(-0.912, 0.096)

0.016^b

-0.340

(-0.729, 0.048)

0.919

1.088

0.086

Funding status

Industry

Reference

Other sources

-0.068

(-1.111, 0.975)

0.897

None or not reported

-0.585

(-1.573, 0.404)

0.245