condition mean min max ZT0-3 75.474821 75.474821 75.474821 ZT4-7 85.218806 85.218806 85.218806 ZT8-11 216.7259395 216.7259395 216.7259395 ZT12-15 499.116795 499.116795 499.116795 ZT16-19 185.0652675 185.0652675 185.0652675 ZT20-23 319.71871999999996 319.71871999999996 319.71871999999996