condition mean min max ZT0-3 5.133414999999999 4.72553 5.5413 ZT4-7 49.5714 49.5714 49.5714 ZT8-11 26.972450000000002 26.972450000000002 26.972450000000002 ZT12-15 0 0 0 ZT16-19 6.54222 6.54222 6.54222 ZT20-23 2.18933 2.18933 2.18933