condition mean min max ZT0-3 1.44712 1.44712 1.44712 ZT4-7 2.5375449999999997 2.5375449999999997 2.5375449999999997 ZT8-11 1.484165 1.484165 1.484165 ZT12-15 1.820435 1.820435 1.820435 ZT16-19 2.7871 2.7871 2.7871 ZT20-23 2.600755 2.600755 2.600755