condition mean min max ZT0-3 6.0240625 5.780355 6.2677700000000005 ZT4-7 5.19285 5.19285 5.19285 ZT8-11 1.387345 1.387345 1.387345 ZT12-15 0 0 0 ZT16-19 3.4958099999999996 3.4958099999999996 3.4958099999999996 ZT20-23 2.918275 2.918275 2.918275