condition mean min max ZT0-3 1.9563549999999998 1.9563549999999998 1.9563549999999998 ZT4-7 1.058312 1.058312 1.058312 ZT8-11 2.618675 2.618675 2.618675 ZT12-15 5.341585 5.341585 5.341585 ZT16-19 4.014355 4.014355 4.014355 ZT20-23 2.6776400000000002 2.6776400000000002 2.6776400000000002