condition mean min max ZT0-3 8.37949 8.37949 8.37949 ZT4-7 4.58756 4.58756 4.58756 ZT8-11 20.5903 20.5903 20.5903 ZT12-15 41.76275 41.76275 41.76275 ZT16-19 32.6576 32.6576 32.6576 ZT20-23 13.449100000000001 13.449100000000001 13.449100000000001