condition mean min max ZT0-3 8394.693595 8394.693595 8394.693595 ZT4-7 9974.3357645 9974.3357645 9974.3357645 ZT8-11 10554.17173 10554.17173 10554.17173 ZT12-15 9951.1968925 9951.1968925 9951.1968925 ZT16-19 8675.720642 8675.720642 8675.720642 ZT20-23 6644.865751 6644.865751 6644.865751