condition mean min max ZT0-3 85.395824 85.395824 85.395824 ZT4-7 94.70477 94.70477 94.70477 ZT8-11 87.4491165 87.4491165 87.4491165 ZT12-15 101.820871 101.820871 101.820871 ZT16-19 98.386281 98.386281 98.386281 ZT20-23 137.1039445 137.1039445 137.1039445