condition mean min max ZT0-3 25.85 25.85 25.85 ZT4-7 13.9 13.9 13.9 ZT8-11 1.7000000000000002 1.7000000000000002 1.7000000000000002 ZT12-15 4.25 4.25 4.25 ZT16-19 21.4 21.4 21.4 ZT20-23 3.6 3.6 3.6