condition mean min max ZT0-3 1.64126225 1.4407495 1.8417750000000002 ZT4-7 3.77057 3.77057 3.77057 ZT8-11 2.8098 2.8098 2.8098 ZT12-15 0 0 0 ZT16-19 2.434315 2.434315 2.434315 ZT20-23 3.213885 3.213885 3.213885