condition mean min max ZT0-3 114.587524 114.587524 114.587524 ZT4-7 192.3012845 192.3012845 192.3012845 ZT8-11 196.363468 196.363468 196.363468 ZT12-15 162.76912399999998 162.76912399999998 162.76912399999998 ZT16-19 123.02448 123.02448 123.02448 ZT20-23 124.564659 124.564659 124.564659