condition mean min max ZT0-3 49.99720000000001 49.99720000000001 49.99720000000001 ZT4-7 39.206149999999994 39.206149999999994 39.206149999999994 ZT8-11 34.49085 34.49085 34.49085 ZT12-15 40.6032 40.6032 40.6032 ZT16-19 45.06975 45.06975 45.06975 ZT20-23 52.619200000000006 52.619200000000006 52.619200000000006