condition mean min max ZT0-3 6.78655 6.78655 6.78655 ZT4-7 7.705820000000001 7.705820000000001 7.705820000000001 ZT8-11 5.849525 5.849525 5.849525 ZT12-15 6.490935 6.490935 6.490935 ZT16-19 6.62803 6.62803 6.62803 ZT20-23 7.120305 7.120305 7.120305