condition mean min max ZT0-3 33.66315 33.66315 33.66315 ZT4-7 28.59795 28.59795 28.59795 ZT8-11 32.13805 32.13805 32.13805 ZT12-15 38.4597 38.4597 38.4597 ZT16-19 44.77515 44.77515 44.77515 ZT20-23 32.4033 32.4033 32.4033