N.H. Rev. Stat. § 281-A:31
If the disability for work resulting from an injury is partial, and the employee is able to work but has not yet reached maximum medical improvement, the employer, or the employer's insurance carrier, during such disability, but not for the first 3 days of disability unless the disability continues for 14 days or longer, shall pay to the injured employee a weekly compensation equal to 60 percent of the difference between the employee's average weekly wage before the injury and the average weekly wage which he or she is able to earn thereafter; but in no instance shall the weekly compensation exceed the amount set forth by the compensation schedule in RSA 281-A:28. Payments shall not continue after the disability ends, nor longer than 262 weeks; and, if the partial disability begins after a period of total disability, the period of total disability shall be deducted from such total period of 262 weeks.
RSA 281-A:31
1988, 194:2. 1990, 254:21. 1994, 3:9, eff. Feb. 8, 1994.