condition mean min max ZT0-3 22.823349999999998 22.823349999999998 22.823349999999998 ZT4-7 9.463705000000001 9.463705000000001 9.463705000000001 ZT8-11 13.33095 13.33095 13.33095 ZT12-15 20.2073 20.2073 20.2073 ZT16-19 27.0918 27.0918 27.0918 ZT20-23 30.673099999999998 30.673099999999998 30.673099999999998