condition mean min max ZT0-3 50.7547 50.7547 50.7547 ZT4-7 39.1911 39.1911 39.1911 ZT8-11 30.71695 30.71695 30.71695 ZT12-15 43.00195 43.00195 43.00195 ZT16-19 54.7508 54.7508 54.7508 ZT20-23 51.7468 51.7468 51.7468