Patent challenges and factors associated with successful patent challengers under the patent linkage system: recent evidence from South Korea after the Korea United States free trade agreement

Table 4 Results of the logistic regression models

	Model I: Being a successful challenger N = 171			Model II: Being an aggressive challenger N = 77
	AOR	95 % CI	P	AOR	95 % CI	P
Innovative
Yes (Ref_no)	1.87	[0.42–9.42]	0.4159	0.90	[0.15–5.15]	0.9052
New drug
Yes (Ref_no)	1.87	[0.62–5.98]	0.2705	0.89	[0.14–5.16]	0.9002
Sales	4.21	[1.60-11.81]	0.0043	1.57	[0.36–7.12]	0.5434
Employees	0.27	[0.09–0.77]	0.0153	1.00	[0.19–5.70]	0.9924
Reimbursed drugs	6.84	[3.29–17.66]	< 0.0001	31.75	[3.49-463.07]	0.0048

ISSN: 1744-8603