condition mean min max ZT0-3 0.6672415 0.6304875 0.7039955 ZT4-7 8.844825 8.844825 8.844825 ZT8-11 7.10042 7.10042 7.10042 ZT12-15 0 0 0 ZT16-19 1.407865 1.407865 1.407865 ZT20-23 1.463115 1.463115 1.463115