condition mean min max ZT0-3 37.734146 37.734146 37.734146 ZT4-7 26.1805895 26.1805895 26.1805895 ZT8-11 33.964545 33.964545 33.964545 ZT12-15 39.0433565 39.0433565 39.0433565 ZT16-19 40.502664 40.502664 40.502664 ZT20-23 49.499537000000004 49.499537000000004 49.499537000000004