condition mean min max ZT0-3 1.7143883333333334 1.085045 2.22934 ZT4-7 4.1645900000000005 4.1645900000000005 4.1645900000000005 ZT8-11 1.2022895 1.2022895 1.2022895 ZT12-15 1.2872462500000001 0.6420715 1.9324210000000002 ZT16-19 1.0339990000000001 1.0339990000000001 1.0339990000000001 ZT20-23 0.6463650000000001 0.6463650000000001 0.6463650000000001