condition mean min max ZT0-3 30.099999999999998 30.099999999999998 30.099999999999998 ZT4-7 4.2 4.2 4.2 ZT8-11 16.2 16.2 16.2 ZT12-15 12.15 12.15 12.15 ZT16-19 3.4000000000000004 3.4000000000000004 3.4000000000000004 ZT20-23 25.9 25.9 25.9