condition mean min max ZT0-3 3.9470825 3.654375 4.23979 ZT4-7 0.8873015 0.8873015 0.8873015 ZT8-11 0.1745685 0.1745685 0.1745685 ZT12-15 0 0 0 ZT16-19 1.5637600000000003 1.5637600000000003 1.5637600000000003 ZT20-23 2.4373050000000003 2.4373050000000003 2.4373050000000003