condition mean min max ZT0-3 0.603415 0.43616699999999997 0.770663 ZT4-7 0.901311 0.901311 0.901311 ZT8-11 2.423685 2.423685 2.423685 ZT12-15 0 0 0 ZT16-19 1.59999 1.59999 1.59999 ZT20-23 1.6935850000000001 1.6935850000000001 1.6935850000000001