condition mean min max ZT0-3 1.72972225025 1.5871029435000001 1.872341557 ZT4-7 3.43797693425 1.387390986 5.4885628825 ZT8-11 13.787227529 11.456490673000001 16.117964385 ZT12-15 8.73690063125 6.441280661 11.0325206015 ZT16-19 3.04155015875 2.892156596 3.1909437215 ZT20-23 7.6066019925 6.734534035499999 8.4786699495