condition mean min max ZT0-3 38.784416666666665 27.73135 45.08985 ZT4-7 31.58865 31.58865 31.58865 ZT8-11 32.33945 32.33945 32.33945 ZT12-15 46.106300000000005 39.471050000000005 52.741550000000004 ZT16-19 41.9746 41.9746 41.9746 ZT20-23 59.545249999999996 59.545249999999996 59.545249999999996