condition mean min max ZT0-3 3.9679124999999997 3.65907 4.276755 ZT4-7 1.1614995000000001 1.1614995000000001 1.1614995000000001 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.955794 0.955794 0.955794 ZT20-23 0.57372 0.57372 0.57372