condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.3839615 0.3839615 0.3839615 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.440578 0.440578 0.440578