condition mean min max ZT0-3 5.523635 5.000565 6.046704999999999 ZT4-7 4.719519999999999 4.719519999999999 4.719519999999999 ZT8-11 4.00941 4.00941 4.00941 ZT12-15 0 0 0 ZT16-19 5.09191 5.09191 5.09191 ZT20-23 4.909865 4.909865 4.909865