condition mean min max ZT0-3 280.352355 280.352355 280.352355 ZT4-7 284.61706000000004 284.61706000000004 284.61706000000004 ZT8-11 329.715067 329.715067 329.715067 ZT12-15 276.395025 276.395025 276.395025 ZT16-19 295.20171200000004 295.20171200000004 295.20171200000004 ZT20-23 333.99519300000003 333.99519300000003 333.99519300000003