condition mean min max ZT0-3 0.0338381 0.0 0.052413 ZT4-7 0.0 0.0 0.0 ZT8-11 0.050516 0.050516 0.050516 ZT12-15 0.07741305 0.0493151 0.105511 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0