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Table 4 Comparison of reporting quality of items of the PRISMA for abstracts of meta-analyses of RCT

From: A comparison of quality of abstracts of systematic reviews including meta-analysis of randomized controlled trials in high-impact general medicine journals before and after the publication of PRISMA extension for abstracts: a systematic review and meta-analysis

Items

Univariable analysisa

Multivariable analysisb

2014 versus 2012

2015 versus 2012

2014 versus 2012

2015 versus 2012

Crude odds ratio (95 % CI)

p

Crude odds ratio (95 % CI)

p

Adjusted odds ratio (95 % CI)

p

Adjusted odds ratio (95 % CI)

p

Title

4.5 (0.52; 38.1)

0.240

4.6 (0.54; 39.4)

0.239

4.4 (0.55; 35.1)

0.163

4.5 (0.46; 43.7)

0.199

Objectives

0.76 (0.34; 1.7)

0.499

1.4 (0.56; 3.3)

0.499

0.78 (0.33; 1.8)

0.564

1.6 (0.66; 4.1)

0.286

Eligibility criteria

0.67 (0.24; 1.9)

0.451

0.70 (0.25; 2.0)

0.496

0.58 (0.17; 2.0)

0.390

0.75 (0.25; 2.3)

0.617

Information sources

2.3 (0.95; 5.4)

0.060

0.86 (0.31; 2.4)

0.770

2.0 (0.70; 5.5)

0.197

0.82 (0.26; 2.6)

0.740

Risk of bias

2.0 (1.003; 4.0)

0.048

0.92 (0.48; 1.8)

0.811

1.2 (0.55; 2.7)

0.625

0.79 (0.36; 1.7)

0.550

Included studies

0.81 (0.41; 1.6)

0.547

0.80 (0.41; 1.6)

0.519

1.1 (0.52; 2.2)

0.834

0.98 (0.50; 2.7)

0.956

Synthesis of results

1.2 (0.57; 2.4)

0.671

Not estimable

<0.001

1.1 (0.52; 2.5)

0.738

Not estimable

 

Description of the effect

0.88 (0.45; 1.7)

0.711

2.0 (0.96; 4.1)

0.063

0.93 (0.45; 1.9)

0.849

2.7 (1.2; 6.1)

0.014

Strengths and Limitations of evidence

0.68 (0.34; 1.4)

0.281

0.38 (0.18; 0.82)

0.012

0.23 (0.07; 0.71)

0.011

0.13 (0.03; 0.66)

0.013

Interpretation

1.4 (0.07; 2.8)

0.474

Not estimable

<0.001

1.9 (0.58; 5.9)

0.297

Not estimable

 

Funding

0.64 (0.29; 1.4)

0.264

1.6 (0.81; 3.3)

0.174

0.25 (0.07; 0.81)

0.021

1.5 (0.56; 4.0)

0.425

Registration

2.2 (0.36; 13.6)

0.404

12.2 (2.7; 56.1)

<0.001

1.9 (0.30; 12.4)

0.485

10.8 (2.3; 49.6)

0.002

  1. CI confidence interval
  2. aChi-squared test
  3. bGeneralized estimation equations with journal as grouping variable: adjustment has been made for abstract word count (<300 versus ≥300), PRISMA endorser journal (yes versus no), abstract format (IMRAD versus 8-headings), publication on behalf a group (yes versus no), number of authors (≤6 versus >6)