condition mean min max ZT0-3 4.8500000000000005 4.8500000000000005 4.8500000000000005 ZT4-7 0.5 0.5 0.5 ZT8-11 6.550000000000001 6.550000000000001 6.550000000000001 ZT12-15 2.0 2.0 2.0 ZT16-19 2.25 2.25 2.25 ZT20-23 2.1500000000000004 2.1500000000000004 2.1500000000000004