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Chronological changes in the lower urinary tract symptom scores using linear mixed-effect model; (a) IPSS, (b) OABSS, (c) IPSS-QOL. Both in the non-SpaceOAR and SpaceOAR groups, IPSS, OABSS, and IPSS-QOL increased at 3 months after LDR-BT, and the scores decreased at 12 months. There was no significant difference in IPSS, OABSS, and IPSS-QOL over time with and without SpaceOAR insertion (P = 0.996, P = 0.932, and P = 0.130, respectively).
