condition mean min max ZT0-3 4.45 4.45 4.45 ZT4-7 2.2 2.2 2.2 ZT8-11 23.150000000000002 23.150000000000002 23.150000000000002 ZT12-15 3.85 3.85 3.85 ZT16-19 3.65 3.65 3.65 ZT20-23 8.35 8.35 8.35