condition mean min max ZT0-3 261.078211 261.078211 261.078211 ZT4-7 290.0637555 290.0637555 290.0637555 ZT8-11 536.1758494999999 536.1758494999999 536.1758494999999 ZT12-15 453.24109550000003 453.24109550000003 453.24109550000003 ZT16-19 594.587276 594.587276 594.587276 ZT20-23 458.8120685 458.8120685 458.8120685