condition mean min max ZT0-3 14.5953 14.5953 14.5953 ZT4-7 15.316949999999999 15.316949999999999 15.316949999999999 ZT8-11 10.50225 10.50225 10.50225 ZT12-15 10.948599999999999 10.948599999999999 10.948599999999999 ZT16-19 12.7161 12.7161 12.7161 ZT20-23 13.152000000000001 13.152000000000001 13.152000000000001