condition mean min max ZT0-3 2.02542 1.635815 2.415025 ZT4-7 4.207375 4.207375 4.207375 ZT8-11 4.831284999999999 4.831284999999999 4.831284999999999 ZT12-15 0 0 0 ZT16-19 4.404485 4.404485 4.404485 ZT20-23 5.042395 5.042395 5.042395