condition mean min max ZT0-3 11.570927 11.570927 11.570927 ZT4-7 10.034903499999999 10.034903499999999 10.034903499999999 ZT8-11 10.330586499999999 10.330586499999999 10.330586499999999 ZT12-15 10.762471 10.762471 10.762471 ZT16-19 11.330231 11.330231 11.330231 ZT20-23 14.615722 14.615722 14.615722