condition mean min max ZT0-3 16.738133333333334 11.07255 19.77915 ZT4-7 9.391595 9.391595 9.391595 ZT8-11 9.451585 9.451585 9.451585 ZT12-15 15.934099999999999 14.34855 17.51965 ZT16-19 17.1072 17.1072 17.1072 ZT20-23 20.47905 20.47905 20.47905