condition mean min max ZT0-3 2025.613994 2025.613994 2025.613994 ZT4-7 2012.570968 2012.570968 2012.570968 ZT8-11 1550.7529494999999 1550.7529494999999 1550.7529494999999 ZT12-15 1590.2638980000002 1590.2638980000002 1590.2638980000002 ZT16-19 1077.3532034999998 1077.3532034999998 1077.3532034999998 ZT20-23 660.7006175 660.7006175 660.7006175