condition mean min max ZT0-3 2.191 2.191 2.191 ZT4-7 2.32991 2.32991 2.32991 ZT8-11 2.29559 2.29559 2.29559 ZT12-15 2.345225 2.345225 2.345225 ZT16-19 2.5880900000000002 2.5880900000000002 2.5880900000000002 ZT20-23 2.34628 2.34628 2.34628