condition mean min max ZT0-3 10.299999999999999 10.299999999999999 10.299999999999999 ZT4-7 8.6 8.6 8.6 ZT8-11 1.6 1.6 1.6 ZT12-15 4.1 4.1 4.1 ZT16-19 1.75 1.75 1.75 ZT20-23 0.8500000000000001 0.8500000000000001 0.8500000000000001