condition mean min max ZT0-3 38.0566 38.0566 38.0566 ZT4-7 34.94645 34.94645 34.94645 ZT8-11 25.75855 25.75855 25.75855 ZT12-15 27.61775 27.61775 27.61775 ZT16-19 29.57945 29.57945 29.57945 ZT20-23 35.28555 35.28555 35.28555