condition mean min max ZT0-3 48.787624 48.787624 48.787624 ZT4-7 35.628573 35.628573 35.628573 ZT8-11 33.339173 33.339173 33.339173 ZT12-15 31.1571645 31.1571645 31.1571645 ZT16-19 36.2339535 36.2339535 36.2339535 ZT20-23 27.131634499999997 27.131634499999997 27.131634499999997