condition mean min max ZT0-3 0.0 0.0 0.0 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 0.04453156 0.0 0.08906312 ZT20-23 0.04575051866666667 0.04280487233333333 0.048696165000000007