condition mean min max ZT0-3 41.733533333333334 37.0361 45.48415 ZT4-7 27.5701 27.5701 27.5701 ZT8-11 47.2358 47.2358 47.2358 ZT12-15 60.747825 54.52525 66.9704 ZT16-19 57.5859 57.5859 57.5859 ZT20-23 66.9678 66.9678 66.9678