condition mean min max ZT0-3 39.728935 39.728935 39.728935 ZT4-7 33.214834499999995 33.214834499999995 33.214834499999995 ZT8-11 42.068501499999996 42.068501499999996 42.068501499999996 ZT12-15 36.076355500000005 36.076355500000005 36.076355500000005 ZT16-19 73.9133815 73.9133815 73.9133815 ZT20-23 50.494240500000004 50.494240500000004 50.494240500000004