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 0.033083975 0.021453 0.04471495 ZT16-19 0.02078555 0.02078555 0.02078555 ZT20-23 0.0 0.0 0.0