condition mean min max ZT0-3 2343.605599 2343.605599 2343.605599 ZT4-7 1879.583338 1879.583338 1879.583338 ZT8-11 1717.671239 1717.671239 1717.671239 ZT12-15 1835.8909390000001 1835.8909390000001 1835.8909390000001 ZT16-19 2987.1644455 2987.1644455 2987.1644455 ZT20-23 3138.7173645000003 3138.7173645000003 3138.7173645000003