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Research collaboration is promoted by governments and research funders but ifthe relative prevalence and merits of collaboration vary internationallydifferent national and disciplinary strategies may be needed to promote it.This study compares the team size and field normalised citation impact ofresearch across all 27 Scopus broad fields in the ten countries with the mostjournal articles indexed in Scopus 2008-2012. The results show that team sizevaries substantially by discipline and country, with Japan (4.2) having twothirds more authors per article than the UK (2.5). Solo authorship is rare inChina (4%) but common in the UK (27%). Whilst increasing team size associateswith higher citation impact in almost all countries and fields, thisassociation is much weaker in China than elsewhere. There are also fielddifferences in the association between citation impact and collaboration. Forexample, larger team sizes in the Business, Management & Accounting category donot seem to associate with greater research impact, and for China and India,solo authorship associates with higher citation impact. Overall, there aresubstantial international and field differences in the extent to whichresearchers collaborate and the extent to which collaboration associates withhigher citation impact.

Academic collaboration rates and citation associations vary substantially between countries and fields