condition mean min max ZT0-3 0.168975 0.0 0.506925 ZT4-7 0.1084335 0.1084335 0.1084335 ZT8-11 0.140854 0.140854 0.140854 ZT12-15 0.39590125 0.3438825 0.44792 ZT16-19 0.415602 0.415602 0.415602 ZT20-23 0.678193 0.678193 0.678193