condition mean min max ZT0-3 4.65 4.65 4.65 ZT4-7 5.1 5.1 5.1 ZT8-11 9.55 9.55 9.55 ZT12-15 2.8499999999999996 2.8499999999999996 2.8499999999999996 ZT16-19 9.65 9.65 9.65 ZT20-23 3.35 3.35 3.35