condition mean min max ZT0-3 14.5164 14.067900000000002 14.9649 ZT4-7 12.376249999999999 12.376249999999999 12.376249999999999 ZT8-11 12.598400000000002 12.598400000000002 12.598400000000002 ZT12-15 0 0 0 ZT16-19 16.40905 16.40905 16.40905 ZT20-23 15.64705 15.64705 15.64705