(1) For purposes of MGL c. 152, § 35C, applicable benefits on the first date of eligibility for benefits shall be based on the employee's average weekly wage as of such first date of eligibility for benefits, or, if the employee is not employed on that date, it shall be based on the employee's average weekly wage as of the employee's last date of employment.

(2) Payment of benefits under MGL c. 152, § § 31, 34, 34A, or 35 within five years of the date of injury shall preclude applicability of MGL c. 152, 35C.

(3) For purposes of MGL c. 152, § 65(2)(b), "adjustments to compensation pursuant to MGL c. 152 § 35C" shall mean any increase in benefits paid to an employee as a result of the applicability of the first subsection of MGL c. 152, § 35C.