condition mean min max ZT0-3 27.443550000000002 21.2304 33.6567 ZT4-7 24.78015 24.78015 24.78015 ZT8-11 9.357795 9.357795 9.357795 ZT12-15 0 0 0 ZT16-19 16.2393 16.2393 16.2393 ZT20-23 31.444000000000003 31.444000000000003 31.444000000000003