condition mean min max ZT0-3 54.580383 54.580383 54.580383 ZT4-7 53.512442500000006 53.512442500000006 53.512442500000006 ZT8-11 51.1907535 51.1907535 51.1907535 ZT12-15 125.326656 125.326656 125.326656 ZT16-19 81.098704 81.098704 81.098704 ZT20-23 168.99734949999998 168.99734949999998 168.99734949999998