condition mean min max ZT0-3 0.75 0.75 0.75 ZT4-7 1.7 1.7 1.7 ZT8-11 8.25 8.25 8.25 ZT12-15 1.6 1.6 1.6 ZT16-19 1.8 1.8 1.8 ZT20-23 4.6000000000000005 4.6000000000000005 4.6000000000000005