condition mean min max ZT0-3 4.03695 3.7894249999999996 4.2844750000000005 ZT4-7 2.0461549999999997 2.0461549999999997 2.0461549999999997 ZT8-11 0.7186980000000001 0.7186980000000001 0.7186980000000001 ZT12-15 0 0 0 ZT16-19 0.6142345 0.6142345 0.6142345 ZT20-23 4.057135000000001 4.057135000000001 4.057135000000001