condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.033302288 0.0 0.066604576 ZT12-15 0.0 0.0 0.0 ZT16-19 0.029417296000000002 0.0 0.058834592000000005 ZT20-23 0.04774673125000001 0.0310336 0.0644598625