condition mean min max ZT0-3 49.77688333333334 49.5386 49.965 ZT4-7 41.59355 41.59355 41.59355 ZT8-11 37.7594 37.7594 37.7594 ZT12-15 50.124575 48.90815 51.341 ZT16-19 46.77955 46.77955 46.77955 ZT20-23 46.8899 46.8899 46.8899