condition mean min max ZT0-3 10.2363 0.0 22.051299999999998 ZT4-7 0.0 0.0 0.0 ZT8-11 4.354675 4.354675 4.354675 ZT12-15 6.405552500000001 4.341105 8.47 ZT16-19 4.052745 4.052745 4.052745 ZT20-23 4.742755 4.742755 4.742755