condition mean min max ZT0-3 69.639565 69.639565 69.639565 ZT4-7 69.807568 69.807568 69.807568 ZT8-11 56.423964 56.423964 56.423964 ZT12-15 69.639565 69.639565 69.639565 ZT16-19 61.1323765 61.1323765 61.1323765 ZT20-23 76.74364800000001 76.74364800000001 76.74364800000001