condition mean min max ZT0-3 5.1401725 4.20786 6.072485 ZT4-7 5.96227 5.96227 5.96227 ZT8-11 5.52196 5.52196 5.52196 ZT12-15 0 0 0 ZT16-19 7.31841 7.31841 7.31841 ZT20-23 8.15077 8.15077 8.15077