condition mean min max ZT0-3 5.210303486 4.684422585 5.736184387 ZT4-7 4.0949097949999995 4.0162754445 4.1735441455 ZT8-11 4.633244932749999 4.31421837 4.9522714955 ZT12-15 3.057623273 2.7502282405 3.3650183055 ZT16-19 3.7352149800000003 3.170126176 4.3003037840000005 ZT20-23 5.2418441717499995 5.196627894999999 5.2870604485