condition mean min max ZT0-3 2.16393 1.97243 2.35543 ZT4-7 2.5960650000000003 2.5960650000000003 2.5960650000000003 ZT8-11 2.5799250000000002 2.5799250000000002 2.5799250000000002 ZT12-15 0 0 0 ZT16-19 5.4849250000000005 5.4849250000000005 5.4849250000000005 ZT20-23 3.74383 3.74383 3.74383