condition mean min max ZT0-3 0.3200286666666667 0.1701725 0.46632 ZT4-7 0.30802 0.30802 0.30802 ZT8-11 0.312477 0.312477 0.312477 ZT12-15 0.49192075 0.3460385 0.637803 ZT16-19 0.29687399999999997 0.29687399999999997 0.29687399999999997 ZT20-23 0.6637120000000001 0.6637120000000001 0.6637120000000001