condition mean min max ZT0-3 188.88507 188.88507 188.88507 ZT4-7 798.0213725 798.0213725 798.0213725 ZT8-11 1207.4007025 1207.4007025 1207.4007025 ZT12-15 1016.8538389999999 1016.8538389999999 1016.8538389999999 ZT16-19 530.5403180000001 530.5403180000001 530.5403180000001 ZT20-23 401.03680299999996 401.03680299999996 401.03680299999996