condition mean min max ZT0-3 28.4415 28.4415 28.4415 ZT4-7 23.82475 23.82475 23.82475 ZT8-11 24.0574 24.0574 24.0574 ZT12-15 21.46595 21.46595 21.46595 ZT16-19 26.5587 26.5587 26.5587 ZT20-23 21.71085 21.71085 21.71085