condition mean min max ZT0-3 467.7 467.7 467.7 ZT4-7 547.3 547.3 547.3 ZT8-11 568.3499999999999 568.3499999999999 568.3499999999999 ZT12-15 583.3499999999999 583.3499999999999 583.3499999999999 ZT16-19 518.0 518.0 518.0 ZT20-23 465.85 465.85 465.85