condition mean min max ZT0-3 79.24429166666667 79.24429166666667 79.24429166666667 ZT4-7 68.98535 68.98535 68.98535 ZT8-11 66.241325 66.241325 66.241325 ZT12-15 71.4293 71.4293 71.4293 ZT16-19 74.51405 74.51405 74.51405 ZT20-23 75.2467 75.2467 75.2467