condition mean min max ZT0-3 0.026488 0.0 0.079464 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.019698625 0.0 0.03939725 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0430424 0.0430424 0.0430424