condition mean min max ZT0-3 248.40333329999999 248.40333329999999 248.40333329999999 ZT4-7 304.5322222333333 304.5322222333333 304.5322222333333 ZT8-11 307.4727778 307.4727778 307.4727778 ZT12-15 234.2811111 234.2811111 234.2811111 ZT16-19 199.2611111 199.2611111 199.2611111 ZT20-23 201.0488889 201.0488889 201.0488889