“…Nine studies included patients with NSLBP for more than 3 months [9, 14-16, 43, 54, 55, 59, 61], two studies included patients with NSLBP over 4-week [57] and 6-week [56] duration, and four studies did not report duration of NSLBP for inclusion [20,58,60,62]. Two studies PLOS ONE included asymptomatic participants that had experienced no NSLBP for at least 2 years [14,15], five studies included participants with no NSLBP the past year [9,[55][56][57]61], three studies recruited participants without a history of NSLBP [16,54,59], and five studies did not report specific inclusion criteria except that the participants were asymptomatic the day of testing [20,42,58,60,62]. Functional disability was reported in all studies except two [43,58], using either the ODI [14-16, 54, 56, 59-62] or the RMDQ [9,20,[55][56][57].…”