condition mean min max ZT0-3 9.352647 9.352647 9.352647 ZT4-7 9.731507 9.731507 9.731507 ZT8-11 9.299439 9.299439 9.299439 ZT12-15 11.321911 11.321911 11.321911 ZT16-19 9.213782 9.213782 9.213782 ZT20-23 9.3481325 9.3481325 9.3481325