condition mean min max ZT0-3 9.0362402475 8.62258698 9.449893515 ZT4-7 5.037867839666667 4.10421279 5.971522889333333 ZT8-11 4.715940483 4.000073045 5.431807921 ZT12-15 7.289122949499999 6.606080179 7.97216572 ZT16-19 5.941406528166667 5.8757322316666665 6.007080824666667 ZT20-23 6.134828873833333 5.762499543666667 6.507158204