condition mean min max ZT0-3 1581.252641 1581.252641 1581.252641 ZT4-7 916.9261855 916.9261855 916.9261855 ZT8-11 823.5144275 823.5144275 823.5144275 ZT12-15 662.393311 662.393311 662.393311 ZT16-19 1200.6553795 1200.6553795 1200.6553795 ZT20-23 1175.305905 1175.305905 1175.305905