condition mean min max ZT0-3 26.890725000000003 25.089750000000002 28.6917 ZT4-7 10.54287 10.54287 10.54287 ZT8-11 6.96086 6.96086 6.96086 ZT12-15 0 0 0 ZT16-19 24.381999999999998 24.381999999999998 24.381999999999998 ZT20-23 29.51375 29.51375 29.51375