condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 8.40238 8.40238 8.40238 ZT12-15 6.2738 6.2738 6.2738 ZT16-19 4.19381 4.19381 4.19381 ZT20-23 2.053445 2.053445 2.053445