condition mean min max ZT0-3 76.393275 75.3336 77.45295 ZT4-7 78.97475 78.97475 78.97475 ZT8-11 74.88535 74.88535 74.88535 ZT12-15 0 0 0 ZT16-19 84.7721 84.7721 84.7721 ZT20-23 76.3563 76.3563 76.3563