condition mean min max ZT0-3 669.4311111 669.4311111 669.4311111 ZT4-7 614.2038889 614.2038889 614.2038889 ZT8-11 501.39388890000004 501.39388890000004 501.39388890000004 ZT12-15 521.7355555333334 521.7355555333334 521.7355555333334 ZT16-19 583.7611111 583.7611111 583.7611111 ZT20-23 617.2988889 617.2988889 617.2988889