condition mean min max ZT0-3 59.31525 59.31525 59.31525 ZT4-7 37.0542 37.0542 37.0542 ZT8-11 46.78555 46.78555 46.78555 ZT12-15 57.61935 57.61935 57.61935 ZT16-19 67.48325 67.48325 67.48325 ZT20-23 69.4686 69.4686 69.4686