Sharing rates in papers concerning mitochondrial and Y chromosomal polymorphisms in humans.

<p>Vertical bars indicate 95% confidence intervals. The total number of scrutinized datasets for each field of research is reported in parentheses. All papers were indexed in Medline from 1/1/2008 to 31/12/2011.</p

Cumulative distributions of papers on ancient human DNA from 1988 to 2013 according to the genetic system investigated.

<p>Cumulative distributions of papers on ancient human DNA from 1988 to 2013 according to the genetic system investigated.</p

Data sharing modalities in human paleogenetics.

<p>Absolute counts are in parentheses.</p><p>Data sharing modalities in human paleogenetics.</p

Procedure used to analyze data sharing in papers regarding human genetic variation.

<p>We retrieved a total of 1187 papers indexed between 1^st January 2008 and 31^st December 2011 in the PubMed using the key words “mtDNA human populations” and “Y chromosome human populations”. We set the following limits: “humans” for species and “English” for language. The procedure used for data request by email is described in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0037552#pone-0037552-g002" target="_blank">figure 2</a>. E-mails “will provide on request” were sent to the corresponding authors to request information from papers where data availability upon request is explicitly declared; E-mails “all authors” were sent to all corresponding authors who withheld datasets.</p

Results of the questionnaire-based survey.

<p>Rates of responses to the question “What is the contribution of the following factors to the higher rate of data sharing in DNA studies of ancient compared to extant humans?”. The absolute values are given in parentheses. See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0121409#sec002" target="_blank">Materials and Methods</a> for complete statements.</p

Frequencies of sharing modalities in the four genetic research fields analyzed.

<p>Rates of usage of different sharing modalities based on the inspection of papers indexed in Medline from 01/01/2008 to 31/12/2011. The total number of scrutinized datasets for each field of research is reported in parentheses. It should be noted that the modality “will provide on request” was observed only by Milia et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0121409#pone.0121409.ref032" target="_blank">32</a>].</p

Data sharing rates in studies of genetic variation of mitochondrial and Y-chromosomal variation in human populations.

<p>Data sharing rates in studies of genetic variation of mitochondrial and Y-chromosomal variation in human populations.</p