condition mean min max ZT0-3 1.15 1.15 1.15 ZT4-7 2.2 2.2 2.2 ZT8-11 3.3 3.3 3.3 ZT12-15 1.05 1.05 1.05 ZT16-19 2.8499999999999996 2.8499999999999996 2.8499999999999996 ZT20-23 4.199999999999999 4.199999999999999 4.199999999999999