condition mean min max ZT0-3 17.28495 16.444399999999998 18.1255 ZT4-7 16.59515 16.59515 16.59515 ZT8-11 13.937899999999999 13.937899999999999 13.937899999999999 ZT12-15 0 0 0 ZT16-19 14.779900000000001 14.779900000000001 14.779900000000001 ZT20-23 17.538449999999997 17.538449999999997 17.538449999999997