condition mean min max ZT0-3 29.85546666666667 27.63245 31.848100000000002 ZT4-7 23.022 23.022 23.022 ZT8-11 21.8006 21.8006 21.8006 ZT12-15 22.867250000000002 21.204900000000002 24.529600000000002 ZT16-19 23.97495 23.97495 23.97495 ZT20-23 26.2607 26.2607 26.2607