condition mean min max ZT0-3 15.396700000000001 15.253350000000001 15.54005 ZT4-7 9.22696 9.22696 9.22696 ZT8-11 12.2975 12.2975 12.2975 ZT12-15 0 0 0 ZT16-19 18.47215 18.47215 18.47215 ZT20-23 18.792650000000002 18.792650000000002 18.792650000000002