condition mean min max ZT0-3 297.192894 297.192894 297.192894 ZT4-7 304.41853100000003 304.41853100000003 304.41853100000003 ZT8-11 297.134866 297.134866 297.134866 ZT12-15 293.82241 293.82241 293.82241 ZT16-19 283.019428 283.019428 283.019428 ZT20-23 279.3434505 279.3434505 279.3434505