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(a): IDB program usage at the six‐month follow‐up visit. (b) Average ODI scores at the six‐month follow‐up of subjects who used the three shorter OFF periods and subjects who used the longer OFF periods (150, 120, and 90 sec OFF). Error bars represents 95% confidence intervals. Statistical differences were observed between the two OFF groups using a Mann–Whitney test. [Color figure can be viewed at wileyonlinelibrary.com]
