condition mean min max ZT0-3 16.675024999999998 16.56815 16.7819 ZT4-7 12.19755 12.19755 12.19755 ZT8-11 12.007950000000001 12.007950000000001 12.007950000000001 ZT12-15 0 0 0 ZT16-19 17.6619 17.6619 17.6619 ZT20-23 13.95235 13.95235 13.95235