condition mean min max ZT0-3 22.054375 20.956899999999997 23.15185 ZT4-7 21.01115 21.01115 21.01115 ZT8-11 32.888 32.888 32.888 ZT12-15 0 0 0 ZT16-19 25.761200000000002 25.761200000000002 25.761200000000002 ZT20-23 25.6259 25.6259 25.6259