Table 2. The association between the endorsement of reporting guidelines or study registration and Journal Impact Factor (2018) in Surgery journals.
| Requirements | Number of endorsed journals (%) | Univariable analysis | Multivariable linear regressiona | ||
|---|---|---|---|---|---|
| GR (95% CI)b | P value | GR (95% CI)b | P value | ||
| Disclosure of COI | 170 (90.4) | 0.865 [0.617–1.211] | 0.395 | 0.836 [0.612–1.140] | 0.253 |
| ICMJE recommendations | 155 (82.4) | 1.002 [0.771–1.303] | 0.989 | 1.054 [0.839–1.327] | 0.647 |
| RCTs registration | 101 (53.7) | 1.406 [1.159–1.706] | 0.001* | 1.422 [1.197–1.694] | <0.001* |
| CONSORT statement | 94 (50.0) | 1.321 [1.089–1.607] | 0.005* | 1.318 [1.104–1.578] | 0.003* |
| PRISMA statement | 66 (35.1) | 1.384 [1.127–1.694] | 0.002* | 1.390 [1.148–1.683] | 0.001* |
| EQUATOR network | 56 (29.8) | 1.205 [0.971–1.496] | 0.091 | 1.242 [0.998–1.542] | 0.052 |
| STROBE statement | 51 (27.1) | 1.581 [1.276–1.959] | <0.001* | 1.556 [1.262–1.919] | <0.001* |
| ARRIVE statement | 44 (23.4) | 0.942 [0.745–1.191] | 0.621 | 0.968 [0.774–1.211] | 0.778 |
| STARD statement | 35 (18.6) | 1.390 [1.081–1.786] | 0.011* | 1.585 [1.216–2.070] | 0.001* |
| CARE statement | 27 (14.4) | 0.851 [0.641–1.130] | 0.262 | 0.933 [0.701–1.242] | 0.631 |
| COREQ statement | 21 (11.2) | 1.279 [0.935–1.754] | 0.123 | 1.309 [0.942–1.820] | 0.108 |
| CHEERS statement | 21 (11.2) | 1.189 [0.867–1.629] | 0.282 | 1.250 [0.902–1.734] | 0.180 |
| SPIRIT statement | 20 (10.6) | 1.081 [0.783–1.493] | 0.634 | 1.052 [0.746–1.479] | 0.775 |
| PRISMA-P statement | 18 (9.6) | 1.016 [0.723–1.426] | 0.931 | 1.002 [0.692–1.445] | 1.000 |
| TRIPOD statement | 18 (9.6) | 1.112 [1.426–1.560] | 0.537 | 1.164 [0.805–1.679] | 0.419 |
| SQUIRE statement | 16 (8.5) | 1.005 [0.703–1.435] | 0.977 | 1.042 [0.697–1.556] | 0.843 |
| SRQR statement | 14 (7.4) | 1.028 [0.703–1.503] | 0.887 | 1.151 [0.728–1.820] | 0.547 |
| RIGHT statement | 12 (6.4) | 0.847 [0.564–1.271] | 0.421 | 0.805 [0.514–1.259] | 0.340 |
| AGREE statement | 12 (6.4) | 0.847 [0.564–1.271] | 0.421 | 0.805 [0.514–1.259] | 0.340 |
| MOOSE statement | 9 (4.8) | 2.301 [1.466–3.614] | <0.001* | 2.113 [1.422–3.133] | <0.001* |
| SRs/MAs registration | 9 (4.8) | 1.211 [0.759–1.928] | 0.421 | 1.091 [0.724–1.641] | 0.676 |
Notes:
*
The difference was statistically significant.
a
The covariables that need to be adjusted in multivariable linear regression are start year, language, region, publisher.
b
GR (95% CI) : geometric means ratio (95% confidence interval), this value is calculated by using the “not endorsed” group as the reference group. For example, GR = 1.422 says that the value of Impact Factor is 42.2% higher for journals that endorse RCT registration, the same is true for other results.