condition mean min max ZT0-3 47.9235 47.9235 47.9235 ZT4-7 35.06825 35.06825 35.06825 ZT8-11 38.76245 38.76245 38.76245 ZT12-15 44.07925 44.07925 44.07925 ZT16-19 48.90015 48.90015 48.90015 ZT20-23 52.18585 52.18585 52.18585