condition mean min max ZT0-3 7.3500000000000005 7.3500000000000005 7.3500000000000005 ZT4-7 5.9 5.9 5.9 ZT8-11 8.25 8.25 8.25 ZT12-15 0.9500000000000001 0.9500000000000001 0.9500000000000001 ZT16-19 8.75 8.75 8.75 ZT20-23 10.3 10.3 10.3