condition mean min max ZT0-3 24.886569 24.886569 24.886569 ZT4-7 29.648176 29.648176 29.648176 ZT8-11 29.8383825 29.8383825 29.8383825 ZT12-15 32.752787 32.752787 32.752787 ZT16-19 32.170664 32.170664 32.170664 ZT20-23 31.242005 31.242005 31.242005