condition mean min max ZT0-3 0.10703873333333333 0.044489 0.1878072 ZT4-7 0.0 0.0 0.0 ZT8-11 0.1832813 0.1832813 0.1832813 ZT12-15 0.072995225 0.0 0.14599045 ZT16-19 0.302016 0.302016 0.302016 ZT20-23 0.6475857500000001 0.6475857500000001 0.6475857500000001