condition mean min max ZT0-3 0.5488106666666667 0.0926365 1.0631295 ZT4-7 0.1846025 0.1846025 0.1846025 ZT8-11 0.6670435 0.6670435 0.6670435 ZT12-15 0.860673 0.8063985 0.9149475 ZT16-19 0.902222 0.902222 0.902222 ZT20-23 0.4086245 0.4086245 0.4086245