condition mean min max ZT0-3 13.1601 13.1601 13.1601 ZT4-7 17.6751 17.6751 17.6751 ZT8-11 14.168849999999999 14.168849999999999 14.168849999999999 ZT12-15 12.3098 12.3098 12.3098 ZT16-19 10.51043 10.51043 10.51043 ZT20-23 8.001940000000001 8.001940000000001 8.001940000000001