condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0211538 0.0199148 0.0223928 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0