condition mean min max ZT0-3 6.347063333333334 0.602135 9.37859 ZT4-7 1.18914 1.18914 1.18914 ZT8-11 38.1027 38.1027 38.1027 ZT12-15 17.237975 16.2461 18.22985 ZT16-19 27.6765 27.6765 27.6765 ZT20-23 22.636699999999998 22.636699999999998 22.636699999999998