condition mean min max ZT0-3 1512.546867 1512.546867 1512.546867 ZT4-7 1381.7257805 1381.7257805 1381.7257805 ZT8-11 1365.6342665 1365.6342665 1365.6342665 ZT12-15 1736.460636 1736.460636 1736.460636 ZT16-19 1760.3199894999998 1760.3199894999998 1760.3199894999998 ZT20-23 1899.1763995000001 1899.1763995000001 1899.1763995000001