condition mean min max ZT0-3 35.79338348 29.74736395 41.83940301 ZT4-7 60.640202851666665 52.41111773333333 68.86928797 ZT8-11 61.01346676 51.55282141 70.47411211 ZT12-15 47.165508474999996 45.31422015 49.016796799999995 ZT16-19 33.907268026666664 31.11218493 36.70235112333333 ZT20-23 30.817602190000002 30.41059615 31.22460823