condition mean min max ZT0-3 6.3500000000000005 6.3500000000000005 6.3500000000000005 ZT4-7 1.6 1.6 1.6 ZT8-11 7.05 7.05 7.05 ZT12-15 4.35 4.35 4.35 ZT16-19 2.45 2.45 2.45 ZT20-23 1.35 1.35 1.35