condition mean min max ZT0-3 23.798433333333335 17.510350000000003 27.04905 ZT4-7 18.89875 18.89875 18.89875 ZT8-11 24.29685 24.29685 24.29685 ZT12-15 24.9857 21.54835 28.42305 ZT16-19 23.3687 23.3687 23.3687 ZT20-23 29.504849999999998 29.504849999999998 29.504849999999998