condition mean min max ZT0-3 2.95 2.95 2.95 ZT4-7 4.6 4.6 4.6 ZT8-11 2.6500000000000004 2.6500000000000004 2.6500000000000004 ZT12-15 3.6500000000000004 3.6500000000000004 3.6500000000000004 ZT16-19 2.8 2.8 2.8 ZT20-23 2.3499999999999996 2.3499999999999996 2.3499999999999996