Table 4. Results of analysis of full dataset.

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
Access type	540.16	3	<0.0001
Author count	2,391.91	9	<0.0001
JCR quartile	115.45	3	<0.0001
AIS	109.91	1	<0.0001
Year	27,708.11	5	<0.0001
Access type × Author count	174.90	25	<0.0001
Access type × JCR quartile	64.10	9	<0.0001
Access type × AIS	36.57	3	<0.0001
Access type × Year	141.52	15	<0.0001