condition mean min max ZT0-3 27.839483333333334 22.6418 32.99355 ZT4-7 39.10055 39.10055 39.10055 ZT8-11 36.34315 36.34315 36.34315 ZT12-15 81.17855 76.03960000000001 86.3175 ZT16-19 56.792699999999996 56.792699999999996 56.792699999999996 ZT20-23 43.1827 43.1827 43.1827