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Table 1 Description of variables

From: 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

Variable Description
Successful patent challenger = 1 if a generic manufacturer, from 2015 to 2019, granted a marketing approval with 9-month exclusivity after challenging a patent and obtaining favorable decision at a court
Aggressive patent challenger = 1 if a generic manufacturer, from 2015 to 2019, achieved 4 and more successful patent challenges
Innovative = 1 if a generic manufacturer designated as innovative pharmaceutical manufacturers by the ministry of health as of 2019
New drug = 1 if a generic manufacturer granted a marketing approval for new drug or modified new drug as of 2019
Sales Total sales of a manufacturer in 2019 (million Korean Won)
Employees Total employees of a manufacturer in 2019 (full time employees)
Reimbursed drugs Total number of reimbursed drugs under the National Health Insurance that a manufacturer granted marketing approval as of 2019