condition mean min max ZT0-3 43.98845 43.98845 43.98845 ZT4-7 38.9236 38.9236 38.9236 ZT8-11 35.28975 35.28975 35.28975 ZT12-15 33.6429 33.6429 33.6429 ZT16-19 44.631 44.631 44.631 ZT20-23 40.8852 40.8852 40.8852