condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.645485 0.645485 0.645485 ZT12-15 0 0 0 ZT16-19 0.622775 0.622775 0.622775 ZT20-23 0.0 0.0 0.0