condition mean min max ZT0-3 25.536083333333334 21.49025 31.86635 ZT4-7 29.8808 29.8808 29.8808 ZT8-11 33.12065 33.12065 33.12065 ZT12-15 37.504325 35.390100000000004 39.61855 ZT16-19 25.8435 25.8435 25.8435 ZT20-23 21.19265 21.19265 21.19265