condition mean min max ZT0-3 3.4000000000000004 3.4000000000000004 3.4000000000000004 ZT4-7 5.8 5.8 5.8 ZT8-11 2.3499999999999996 2.3499999999999996 2.3499999999999996 ZT12-15 8.75 8.75 8.75 ZT16-19 4.05 4.05 4.05 ZT20-23 24.9 24.9 24.9