condition mean min max ZT0-3 0.7477945 0.7477945 0.7477945 ZT4-7 0.2424505 0.2424505 0.2424505 ZT8-11 0.1969415 0.1969415 0.1969415 ZT12-15 0.2806155 0.2806155 0.2806155 ZT16-19 0.9871639999999999 0.9871639999999999 0.9871639999999999 ZT20-23 0.9438525 0.9438525 0.9438525