condition mean min max ZT0-3 4.873899999999999 4.657035 5.090764999999999 ZT4-7 2.80389 2.80389 2.80389 ZT8-11 3.224785 3.224785 3.224785 ZT12-15 0 0 0 ZT16-19 4.52506 4.52506 4.52506 ZT20-23 4.342955 4.342955 4.342955