condition mean min max ZT0-3 1.9500000000000002 1.9500000000000002 1.9500000000000002 ZT4-7 2.6 2.6 2.6 ZT8-11 2.5 2.5 2.5 ZT12-15 5.55 5.55 5.55 ZT16-19 2.7 2.7 2.7 ZT20-23 13.55 13.55 13.55