condition mean min max ZT0-3 22.119374999999998 20.65225 23.5865 ZT4-7 28.59855 28.59855 28.59855 ZT8-11 37.107600000000005 37.107600000000005 37.107600000000005 ZT12-15 0 0 0 ZT16-19 45.97455 45.97455 45.97455 ZT20-23 35.1259 35.1259 35.1259