condition mean min max ZT0-3 225.219129 225.219129 225.219129 ZT4-7 369.42114349999997 369.42114349999997 369.42114349999997 ZT8-11 397.30057850000003 397.30057850000003 397.30057850000003 ZT12-15 424.0481775 424.0481775 424.0481775 ZT16-19 354.535853 354.535853 354.535853 ZT20-23 316.01753699999995 316.01753699999995 316.01753699999995