condition mean min max ZT0-3 0.05353528333333333 0.0 0.10024685 ZT4-7 0.0387977 0.0387977 0.0387977 ZT8-11 0.01971695 0.01971695 0.01971695 ZT12-15 0.07923915 0.0191751 0.1393032 ZT16-19 0.0 0.0 0.0 ZT20-23 0.062126 0.062126 0.062126