condition mean min max ZT0-3 2.74492 2.74492 2.74492 ZT4-7 2.3313 2.3313 2.3313 ZT8-11 2.8828300000000002 2.8828300000000002 2.8828300000000002 ZT12-15 3.2596100000000003 3.2596100000000003 3.2596100000000003 ZT16-19 4.28765 4.28765 4.28765 ZT20-23 3.1071850000000003 3.1071850000000003 3.1071850000000003