condition mean min max ZT0-3 8.2 8.2 8.2 ZT4-7 12.9 12.9 12.9 ZT8-11 4.8500000000000005 4.8500000000000005 4.8500000000000005 ZT12-15 8.15 8.15 8.15 ZT16-19 9.5 9.5 9.5 ZT20-23 1.15 1.15 1.15