condition mean min max ZT0-3 53.99615 53.99615 53.99615 ZT4-7 45.3874 45.3874 45.3874 ZT8-11 42.1196 42.1196 42.1196 ZT12-15 48.59765 48.59765 48.59765 ZT16-19 55.47915 55.47915 55.47915 ZT20-23 56.7344 56.7344 56.7344