condition mean min max ZT0-3 10.795448333333333 5.55888 20.795749999999998 ZT4-7 8.820895 8.820895 8.820895 ZT8-11 13.68485 13.68485 13.68485 ZT12-15 18.7023625 13.308475 24.09625 ZT16-19 23.6902 23.6902 23.6902 ZT20-23 12.882850000000001 12.882850000000001 12.882850000000001