condition mean min max ZT0-3 21.693433 21.693433 21.693433 ZT4-7 45.956897 45.956897 45.956897 ZT8-11 117.9619005 117.9619005 117.9619005 ZT12-15 72.798165 72.798165 72.798165 ZT16-19 99.3265985 99.3265985 99.3265985 ZT20-23 93.2907065 93.2907065 93.2907065