condition mean min max ZT0-3 0.09694866666666667 0.0 0.290846 ZT4-7 2.22813 2.22813 2.22813 ZT8-11 6.723115 6.723115 6.723115 ZT12-15 1.8720525000000001 1.77827 1.9658350000000002 ZT16-19 1.78086 1.78086 1.78086 ZT20-23 0.301307 0.301307 0.301307