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Type II Wald chi-square tests were used. Thus, significance tests of interactions terms were marginal, but significance tests of main-effects terms were marginal excluding all interaction terms.
| Variable | χ 2 | df | p-value |
|---|---|---|---|
| APC | 2.16 | 1 | 0.14 |
| Author count | 172.62 | 1 | <0.0001 |
| JCR quartile | 35.79 | 3 | <0.0001 |
| AIS | 62.51 | 1 | <0.0001 |
| Year | 3,284.59 | 5 | <0.0001 |
| APC × Author count | 1.91 | 1 | 0.17 |
| APC × JCR quartile | 5.20 | 3 | 0.15 |
| APC × AIS | 12.90 | 1 | 0.0003 |
| APC × Year | 19.50 | 5 | 0.0015 |
