condition mean min max ZT0-3 1.325745 1.317615 1.333875 ZT4-7 1.3298299999999998 1.3298299999999998 1.3298299999999998 ZT8-11 0.8424315 0.8424315 0.8424315 ZT12-15 0 0 0 ZT16-19 0.9537074999999999 0.9537074999999999 0.9537074999999999 ZT20-23 0.7188844999999999 0.7188844999999999 0.7188844999999999