condition mean min max ZT0-3 2.05 2.05 2.05 ZT4-7 2.5 2.5 2.5 ZT8-11 2.95 2.95 2.95 ZT12-15 2.8499999999999996 2.8499999999999996 2.8499999999999996 ZT16-19 13.4 13.4 13.4 ZT20-23 4.9 4.9 4.9