condition mean min max ZT0-3 3.9584699999999997 2.655145 5.261794999999999 ZT4-7 0.3698355 0.3698355 0.3698355 ZT8-11 0.563335 0.563335 0.563335 ZT12-15 0 0 0 ZT16-19 3.7197449999999996 3.7197449999999996 3.7197449999999996 ZT20-23 0.0908395 0.0908395 0.0908395