TABLE I.

Mean Scores for Anxiety, Depression, and Emotional Distress and Mean ISSs Across Time Points

	Time 1 (baseline) M (SD)	Time 2 (6 weeks) M (SD)	Time 3 (12 weeks) M (SD)
Mental health
Anxiety	6.2 (3.0)	5.5 (2.8)	5.4 (2.6)
Depression	5.2 (2.4)	5.1 (2.5)	5.0 (2.3)
Emotional distress composite	5.7 (2.5)	5.3 (2.5)	5.2 (2.3)
Impact of LBP
Total ISS	24.2 (8.4)	19.1 (8.8)	17.9 (9.1)

Abbreviations: ISS = Impact Stratification Score, LBP = low back pain.

Emotional distress composite score is calculated as the average of anxiety and depression scores. The range for anxiety, depression, and emotional distress scores is from 4 to 20. The range for ISSs is from 8 to 50.