condition mean min max ZT0-3 5.15 5.15 5.15 ZT4-7 0.8 0.8 0.8 ZT8-11 2.8499999999999996 2.8499999999999996 2.8499999999999996 ZT12-15 14.0 14.0 14.0 ZT16-19 2.75 2.75 2.75 ZT20-23 2.3 2.3 2.3