condition mean min max ZT0-3 410.232057 410.232057 410.232057 ZT4-7 399.69732799999997 399.69732799999997 399.69732799999997 ZT8-11 414.96664499999997 414.96664499999997 414.96664499999997 ZT12-15 436.341535 436.341535 436.341535 ZT16-19 415.739593 415.739593 415.739593 ZT20-23 441.443653 441.443653 441.443653