condition mean min max ZT0-3 67.109933 67.109933 67.109933 ZT4-7 57.233938 57.233938 57.233938 ZT8-11 67.0970825 67.0970825 67.0970825 ZT12-15 62.926623500000005 62.926623500000005 62.926623500000005 ZT16-19 73.055988 73.055988 73.055988 ZT20-23 72.298217 72.298217 72.298217