condition mean min max ZT0-3 5.195505000000001 5.08256 5.308450000000001 ZT4-7 6.503690000000001 6.503690000000001 6.503690000000001 ZT8-11 5.29138 5.29138 5.29138 ZT12-15 0 0 0 ZT16-19 4.805595 4.805595 4.805595 ZT20-23 4.1943850000000005 4.1943850000000005 4.1943850000000005