condition mean min max ZT0-3 1002.631038 1002.631038 1002.631038 ZT4-7 784.2665065 784.2665065 784.2665065 ZT8-11 464.5541135 464.5541135 464.5541135 ZT12-15 333.768421 333.768421 333.768421 ZT16-19 99.3985815 99.3985815 99.3985815 ZT20-23 47.602843 47.602843 47.602843