condition mean min max ZT0-3 5.7420925 2.652835 8.83135 ZT4-7 8.112795 8.112795 8.112795 ZT8-11 9.59756 9.59756 9.59756 ZT12-15 0 0 0 ZT16-19 11.106765 11.106765 11.106765 ZT20-23 5.368665 5.368665 5.368665