condition mean min max ZT0-3 38.638866666666665 16.2455 50.1 ZT4-7 31.22325 31.22325 31.22325 ZT8-11 73.815 73.815 73.815 ZT12-15 34.677674999999994 25.548949999999998 43.8064 ZT16-19 49.74985 49.74985 49.74985 ZT20-23 55.6909 55.6909 55.6909