condition mean min max ZT0-3 13.418405 13.418405 13.418405 ZT4-7 16.353894500000003 16.353894500000003 16.353894500000003 ZT8-11 20.510456 20.510456 20.510456 ZT12-15 23.879107 23.879107 23.879107 ZT16-19 16.7533875 16.7533875 16.7533875 ZT20-23 20.260420500000002 20.260420500000002 20.260420500000002