condition mean min max ZT0-3 38.107007 38.107007 38.107007 ZT4-7 34.6276215 34.6276215 34.6276215 ZT8-11 34.231916 34.231916 34.231916 ZT12-15 35.6815775 35.6815775 35.6815775 ZT16-19 27.851405 27.851405 27.851405 ZT20-23 23.257424999999998 23.257424999999998 23.257424999999998