condition mean min max ZT0-3 63.774633 63.774633 63.774633 ZT4-7 56.1908875 56.1908875 56.1908875 ZT8-11 64.79341450000001 64.79341450000001 64.79341450000001 ZT12-15 56.580805 56.580805 56.580805 ZT16-19 69.834755 69.834755 69.834755 ZT20-23 82.4991125 82.4991125 82.4991125