condition mean min max ZT0-3 318.905899 318.905899 318.905899 ZT4-7 230.630029 230.630029 230.630029 ZT8-11 154.7741905 154.7741905 154.7741905 ZT12-15 258.3183425 258.3183425 258.3183425 ZT16-19 174.514205 174.514205 174.514205 ZT20-23 238.60563199999999 238.60563199999999 238.60563199999999