condition mean min max ZT0-3 11.260527 11.260527 11.260527 ZT4-7 13.066854500000002 13.066854500000002 13.066854500000002 ZT8-11 12.118652 12.118652 12.118652 ZT12-15 10.438811000000001 10.438811000000001 10.438811000000001 ZT16-19 11.9365645 11.9365645 11.9365645 ZT20-23 12.845824499999999 12.845824499999999 12.845824499999999