condition mean min max ZT0-3 21.45 21.45 21.45 ZT4-7 5.4 5.4 5.4 ZT8-11 3.6500000000000004 3.6500000000000004 3.6500000000000004 ZT12-15 24.5 24.5 24.5 ZT16-19 31.75 31.75 31.75 ZT20-23 25.8 25.8 25.8