Table 2 Bibliometric statistics and network measures in three centers
| Â | DDRC | EMRC | PSRC | pvalue |
|---|---|---|---|---|
Total papers | 48 | 50 | 54 | - |
Total authors (size of network) | 39 | 33 | 36 | - |
Papers per author (median(IQ range)) | 4(4) | 4(4) | 2(2.75) | P = 0.006 |
Maximum papers per author | 42 | 43 | 22 | - |
Mean authors per paper | 5(3) | 4(2.2) | 2.7(1.3) | p < 0.0001 |
Maximum authors per paper | 12 | 11 | 6 | - |
Co-authorship network | Â | Â | Â | Â |
Average co-authorship (median(IQ range)) | 23(35) | 18(15) | 6.5(7.5) | p < 0.0001 |
Collaborators per author (median(IQ range)) | 14(9) | 10(7.5) | 5(3) | p < 0.0001 |
Network centralization | Â | Â | Â | Â |
Degree centralization | 61.5% | 63.8% | 50.6% | - |
Betweenness centralization | 15.6% | 27.7% | 57.2% | - |
Small world phenomenon | Â | Â | Â | Â |
Average density | .417 | .369 | .151 | - |
Clustering coefficient | .729 | .717 | .735 | - |
Mean geodesic distance | 1.6 | 1.6 | 2.3 | - |
Outsiders | Â | Â | Â | Â |
Outsiders per author (median(IQ range)) | 21(26) | 6(10) | 5.5(5) | p < 0.0001 |
Spearman's correlation of inside and outside collaborations | 0.8(p < 0.001) | 0.49(p < 0.001) | 0.32(p > 0.05) | - |