condition mean min max ZT0-3 8.071042559 7.837190567 8.304894551 ZT4-7 8.0778397455 6.8639453965 9.2917340945 ZT8-11 7.866801982749999 7.0538271185 8.679776847 ZT12-15 8.15762938675 6.830959548999999 9.484299224499999 ZT16-19 15.9656410675 14.224780155000001 17.70650198 ZT20-23 26.1234774025 20.22980961 32.017145195