condition mean min max ZT0-3 9.1994775 8.75263 9.646325000000001 ZT4-7 6.385645 6.385645 6.385645 ZT8-11 9.028929999999999 9.028929999999999 9.028929999999999 ZT12-15 0 0 0 ZT16-19 11.0959 11.0959 11.0959 ZT20-23 10.8107 10.8107 10.8107