condition mean min max ZT0-3 322.539749 322.539749 322.539749 ZT4-7 225.7428385 225.7428385 225.7428385 ZT8-11 221.005305 221.005305 221.005305 ZT12-15 250.336746 250.336746 250.336746 ZT16-19 243.1287555 243.1287555 243.1287555 ZT20-23 234.42911700000002 234.42911700000002 234.42911700000002