condition mean min max ZT0-3 35.212333 35.212333 35.212333 ZT4-7 29.657479000000002 29.657479000000002 29.657479000000002 ZT8-11 24.619577 24.619577 24.619577 ZT12-15 29.706682 29.706682 29.706682 ZT16-19 27.138903499999998 27.138903499999998 27.138903499999998 ZT20-23 21.244463000000003 21.244463000000003 21.244463000000003