condition mean min max ZT0-3 1.30121844825 0.669749561 1.9326873354999998 ZT4-7 1.8111503784999998 1.6251839024999999 1.9971168545 ZT8-11 0.8684846104999999 0.6633777144999999 1.0735915065 ZT12-15 0.5009146357500001 0.299134122 0.7026951495 ZT16-19 0.8040841840000001 0.47457508200000004 1.1335932860000002 ZT20-23 4.03376482825 3.1479568154999997 4.919572841