condition mean min max ZT0-3 470.462826 470.462826 470.462826 ZT4-7 243.743359 243.743359 243.743359 ZT8-11 262.354878 262.354878 262.354878 ZT12-15 349.247889 349.247889 349.247889 ZT16-19 429.1088205 429.1088205 429.1088205 ZT20-23 452.56167849999997 452.56167849999997 452.56167849999997