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. 2018 Nov 20;2018(11):MR000005. doi: 10.1002/14651858.MR000005.pub4

Wilson 2015.

Methods Identification of subsequent full‐length publications

  • Searched electronic database

    • Embase, MEDLINE, and ALOIS; dates of search not reported

    • Search completed by the investigator

    • Searched by first and last author

    • Matching criteria not reported

  • Contacted abstract authors directly
Data

  • Included 250 abstracts presented at the 2009 International Psychogeriatric Association Congress, Clinical Trials on Alzheimer’s Disease and Alzheimer’s Association International Conference meetings

  • Included all abstracts related to dementia diagnosis
Comparisons

  • Proportion of abstracts published

  • 'Positive' versus not 'positive'

  • Oral versus poster presentation

  • European versus North American versus rest of world origin

  • Sample size

  • Meeting

  • Clinic versus community versus Alzheimer's Disease Neuroimaging Initiative versus unknown setting

  • Imaging versus cerebrospinal fluid versus other biomarkers versus non‐biomarkers

  • Inclusion of participant with versus without mild cognitive impairment
Outcomes

  • 97 of 250 abstracts published

  • Proportion of abstracts published by time not reported

  • Factors related to proportion of abstracts published included

    • 87/209 abstracts with 'positive' (defined as 'experimental better than control’) versus 10/41 abstracts with not 'positive' abstract results published

    • 26/53 abstracts presented orally versus 71/197 abstracts presented as poster published

    • 44/105 abstracts with sample size > 100 versus 35/16 abstracts with sample size < 100 published

    • 36/85 abstracts originating in North America versus 40/91 abstracts originating in Europe versus 10/44 abstracts originating elsewhere versus 11/30 abstracts of international origin published
Notes

  • Neurology ‐ dementia

  • Received 'grant funding'
Risk of bias
Item Authors' judgement Description
Sampling method? Yes Included all abstracts of a specific topic.
Search for publications? Yes Searched 3 databases and contacted abstract authors directly.
Follow‐up time? Unclear Dates of search not reported.
Matching? Unclear Matching criteria not reported.
Adjustment for confounding? Yes Examined association of meeting, positive results, type of presentation, sample size, country of origin, setting, type test, and inclusion criteria with publication using multivariable logistic regression.