condition mean min max ZT0-3 1.37062625 1.1232425 1.61801 ZT4-7 1.7695414999999999 1.7695414999999999 1.7695414999999999 ZT8-11 2.582525 2.582525 2.582525 ZT12-15 0 0 0 ZT16-19 2.2262750000000002 2.2262750000000002 2.2262750000000002 ZT20-23 1.2779465 1.2779465 1.2779465