condition mean min max ZT0-3 0.39504700000000004 0.39504700000000004 0.39504700000000004 ZT4-7 0.4865335 0.4865335 0.4865335 ZT8-11 0.311603 0.311603 0.311603 ZT12-15 0.482144 0.482144 0.482144 ZT16-19 0.546916 0.546916 0.546916 ZT20-23 0.6773495 0.6773495 0.6773495