To compare the quality of life between groups via the EuroQol Group’s EQ-5D system, utility values should be used. These values can be obtained by converting raw data using the time-trade-off method. Previously, we did not comprehend this complicated calculation well, and thus we included incorrect results for the EQ-5D values in our published article. We now take the opportunity to correct our errors. All corrections are marked in bold typeface.
Page 303, Table 1: the preoperative EQ-5D scores were initially shown as 0.42 ± 0.04 in the percutaneous transforaminal endoscopic discectomy (PTED) group and 0.44 ± 0.04 in the microendoscopic discectomy (MED) group, with a p value of 0.683. The corrected data are EQ-5D scores of 0.53 ± 0.25 in the PTED group and 0.52 ± 0.25 in the MED group, with a p value of 0.819.
Baseline clinical characteristics and demographic data of 153 patients
Page 304, Outcome Assessment, paragraph 2: We originally stated, “EQ-5D (ranging from 0 to 1, with a higher score indicating better quality of life).” The corrected phrase now reads “EQ-5D (ranging from −0.149 to 1, with a higher score indicating better quality of life).”
Page 305, Fig. 3: In accordance with the corrected EQ-5D scores shown in Table 2, we have also corrected panel E (EQ-5D) in Fig. 3 (see correction on the following page).
It should be noted that our corrections do not change the results or conclusions of our study. We apologize for making these errors and appreciate the opportunity to correct them at this time.
The article has been corrected online as of July 26, 2019.
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