condition mean min max ZT0-3 0.6249407499999999 0.518663 0.7312185 ZT4-7 0.6240435 0.6240435 0.6240435 ZT8-11 0.41882699999999995 0.41882699999999995 0.41882699999999995 ZT12-15 0 0 0 ZT16-19 0.308601 0.308601 0.308601 ZT20-23 0.92907 0.92907 0.92907