condition mean min max ZT0-3 3.105704 3.105704 3.105704 ZT4-7 1.2616 1.2616 1.2616 ZT8-11 1.102215 1.102215 1.102215 ZT12-15 0.0 0.0 0.0 ZT16-19 0.63519 0.63519 0.63519 ZT20-23 1.45712 1.45712 1.45712