condition mean min max ZT0-3 0.68763275 0.32701475 1.048587 ZT4-7 0.4570545 0.4570545 0.4570545 ZT8-11 0.6798580000000001 0.6798580000000001 0.6798580000000001 ZT12-15 0.3193915 0.305776 0.333007 ZT16-19 0.39430695 0.39430695 0.39430695 ZT20-23 1.3917905 1.3917905 1.3917905