condition mean min max ZT0-3 2490.67679 2490.67679 2490.67679 ZT4-7 2632.051084 2632.051084 2632.051084 ZT8-11 2258.490672 2258.490672 2258.490672 ZT12-15 2430.507445 2430.507445 2430.507445 ZT16-19 2035.4193529999998 2035.4193529999998 2035.4193529999998 ZT20-23 2260.381976 2260.381976 2260.381976