condition mean min max ZT0-3 9.779428333333334 2.808835 20.4926 ZT4-7 5.49685 5.49685 5.49685 ZT8-11 17.32985 17.32985 17.32985 ZT12-15 16.458 12.050049999999999 20.865949999999998 ZT16-19 27.152549999999998 27.152549999999998 27.152549999999998 ZT20-23 18.584899999999998 18.584899999999998 18.584899999999998