condition mean min max ZT0-3 2.2798049999999996 2.2797099999999997 2.2799 ZT4-7 2.2072849999999997 2.2072849999999997 2.2072849999999997 ZT8-11 2.2332549999999998 2.2332549999999998 2.2332549999999998 ZT12-15 0 0 0 ZT16-19 2.3705249999999998 2.3705249999999998 2.3705249999999998 ZT20-23 2.87514 2.87514 2.87514