condition mean min max ZT0-3 69.89816666666667 30.6627 96.8549 ZT4-7 18.6845 18.6845 18.6845 ZT8-11 14.437850000000001 14.437850000000001 14.437850000000001 ZT12-15 40.87695 34.1229 47.631 ZT16-19 47.50495 47.50495 47.50495 ZT20-23 77.99595 77.99595 77.99595