condition mean min max ZT0-3 37.8692 37.8692 37.8692 ZT4-7 18.76305 18.76305 18.76305 ZT8-11 13.28215 13.28215 13.28215 ZT12-15 18.9153 18.9153 18.9153 ZT16-19 23.892049999999998 23.892049999999998 23.892049999999998 ZT20-23 43.33855 43.33855 43.33855