condition mean min max ZT0-3 35.52173333333334 26.40905 40.37595 ZT4-7 23.1097 23.1097 23.1097 ZT8-11 20.9036 20.9036 20.9036 ZT12-15 21.035325 20.681350000000002 21.3893 ZT16-19 20.55995 20.55995 20.55995 ZT20-23 34.5863 34.5863 34.5863