condition mean min max ZT0-3 172.34447217500002 135.08633805 209.60260630000002 ZT4-7 74.79643175250001 67.20972424 82.38313926500001 ZT8-11 77.99020395 74.302197535 81.678210365 ZT12-15 51.021577394999994 44.84853347 57.194621319999996 ZT16-19 71.2826481925 53.37205394 89.19324244500001 ZT20-23 178.9867258 138.9412929 219.0321587