Table 4. Number of authors per paper by region.
| Region |
||||||||||
| N |
Japan |
USA |
Other |
F | df |
P* |
||||
| n | Mean (SD) | n | Mean (SD) | n | Mean (SD) | |||||
| All papers | 725 | 192 | 5.78 (1.98) | 165 | 3.78 (1.72) | 368 | 3.76 (1.51) | 99.50 | 2722 | <0.01 |
| Clinical research | 384 | 117 | 5.97 (1.84) | 61 | 3.67 (1.55) | 206 | 3.72 (1.46) | 81.23 | 2381 | <0.01 |
| Diagnostic efficacy | 246 | 57 | 5.75 (1.92) | 72 | 3.90 (1.73) | 117 | 3.68 (1.31) | 34.60 | 2243 | <0.01 |
df, degrees of freedom; SD, standard deviation. *All post hoc pairwise comparisons were statistically significant (Tukey honestly significant difference, P < 0.01): Japan > USA, other