condition mean min max ZT0-3 5.5175833333333335 5.5175833333333335 5.5175833333333335 ZT4-7 1.793288 1.793288 1.793288 ZT8-11 1.705284 1.705284 1.705284 ZT12-15 3.2592499999999998 3.2592499999999998 3.2592499999999998 ZT16-19 6.99337 6.99337 6.99337 ZT20-23 5.74598 5.74598 5.74598