condition mean min max ZT0-3 10.9339425 9.864935 12.00295 ZT4-7 10.699195 10.699195 10.699195 ZT8-11 14.64765 14.64765 14.64765 ZT12-15 0 0 0 ZT16-19 19.581899999999997 19.581899999999997 19.581899999999997 ZT20-23 15.126100000000001 15.126100000000001 15.126100000000001