condition mean min max ZT0-3 6.6986574999999995 6.642804999999999 6.75451 ZT4-7 5.885105 5.885105 5.885105 ZT8-11 4.867965 4.867965 4.867965 ZT12-15 0 0 0 ZT16-19 12.801995 12.801995 12.801995 ZT20-23 4.571540000000001 4.571540000000001 4.571540000000001