Oregon Revised Statutes Labor and Employment; Unlawful Discrimination § 657.170

(1) If the Director of the Employment Department finds that during the base year of the individual any individual has been incapable of work during the greater part of any calendar quarter, such base year shall be extended a calendar quarter. Except as provided in subsection (2) of this section, no such extension of an individual's base year shall exceed four calendar quarters.

(2) If the director finds that during and prior to the individual's base year the individual has had a period of temporary total disability caused by illness or injury and has received compensation under ORS chapter 656 for a period of temporary total disability during the greater part of any calendar quarter, the individual's base year shall be extended as many calendar quarters as necessary to establish a valid claim, up to a maximum of four calendar quarters prior to the quarter in which the illness or injury occurred, if the individual:

(3) Notwithstanding the provisions of this section, benefits payable as a result of the use of wages paid in a calendar quarter prior to the individual's current base year shall not exceed one-third of such wages less benefits paid previously as a result of the use of such wages in computing a previous benefit determination.