condition mean min max ZT0-3 0.0525435 0.0525435 0.0525435 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.230059 0.230059 0.230059 ZT20-23 0.0289753 0.0289753 0.0289753