condition mean min max ZT0-3 33.10625 33.10625 33.10625 ZT4-7 39.03915 39.03915 39.03915 ZT8-11 25.3283 25.3283 25.3283 ZT12-15 21.7994 21.7994 21.7994 ZT16-19 19.39365 19.39365 19.39365 ZT20-23 29.27465 29.27465 29.27465