condition mean min max ZT0-3 42.149847865 34.52034891 49.77934682 ZT4-7 17.100764495 17.070890640000002 17.130638349999998 ZT8-11 12.59111805125 12.40531946 12.7769166425 ZT12-15 8.319865310499999 7.737072186000001 8.902658435 ZT16-19 8.554344528249999 6.237773306499999 10.87091575 ZT20-23 21.023509245 16.767842425 25.279176065