Fig. 2

Comparison of quality of life scores before and after treatment between the two groups (\( \overline{\mathrm{x}} \) ± s). The horizontal axis indicated before and after treatment, and the vertical axis indicated the quality of life scores (points); before and after treatment, the patients’ quality of life scores of the RLPN group were 56.81 ± 6.54 and 72.31 ± 6.52, respectively, and those of the OPN group were 56.87 ± 6.48 and 65.61 ± 6.27, respectively; the single asterisk (*) indicated that before and after treatment, the patients’ quality of life scores of the RLPN group were clearly different (t = 8.223, P < 0.001); double asterisk (**) symbol indicated that before and after treatment, the patients’ quality of life scores of the OPN group were clearly different (t = 4.942, P < 0.001); and triple asterisk (***) symbol indicated that after treatment, the patients’ quality of life scores of both groups were clearly different (t = 3.704, P < 0.05)