condition mean min max ZT0-3 5.3418399999999995 5.3418399999999995 5.3418399999999995 ZT4-7 4.36838 4.36838 4.36838 ZT8-11 4.467125 4.467125 4.467125 ZT12-15 8.094045 8.094045 8.094045 ZT16-19 5.959455 5.959455 5.959455 ZT20-23 7.29651 7.29651 7.29651