Instrumentation
All ROM measurements were obtained using a universal goniometer. Within-session interrater and intrarater reliability of hip extension ROM measurements were assessed prior to the study in a sample of 20 subjects without lumbar or lower-quarter symptoms. We chose to use asymptomatic subjects to assess reliability procedures because these subjects were easily accessible. The procedures used to assess reliability also were used in the study, and the ROM measurements were taken by the same examiners who took measurements during the study. Intraclass correlation coefficients (ICC [3,3]) for interrater and intrarater reliability were .98 and were similar to the ICCs (1,2) of .86 to .95 previously reported by Godges et al.4