condition mean min max ZT0-3 0.48723266666666665 0.4271335 0.532284 ZT4-7 0.47120550000000005 0.47120550000000005 0.47120550000000005 ZT8-11 0.487486 0.487486 0.487486 ZT12-15 0.31458905 0.1404871 0.488691 ZT16-19 0.295459 0.295459 0.295459 ZT20-23 0.7658389999999999 0.7658389999999999 0.7658389999999999