condition mean min max ZT0-3 32.818975 29.95455 35.6834 ZT4-7 29.4564 29.4564 29.4564 ZT8-11 33.39255 33.39255 33.39255 ZT12-15 0 0 0 ZT16-19 35.390950000000004 35.390950000000004 35.390950000000004 ZT20-23 32.30015 32.30015 32.30015