condition mean min max ZT0-3 1.10201 0.749379 1.349375 ZT4-7 0.6999515000000001 0.6999515000000001 0.6999515000000001 ZT8-11 1.271988 1.271988 1.271988 ZT12-15 1.707865 1.607725 1.808005 ZT16-19 2.420185 2.420185 2.420185 ZT20-23 2.3994549999999997 2.3994549999999997 2.3994549999999997