condition mean min max ZT0-3 10.5 10.5 10.5 ZT4-7 1.2 1.2 1.2 ZT8-11 7.85 7.85 7.85 ZT12-15 3.6 3.6 3.6 ZT16-19 1.6500000000000001 1.6500000000000001 1.6500000000000001 ZT20-23 14.649999999999999 14.649999999999999 14.649999999999999