condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0045243625 0.0 0.009048725 ZT8-11 0.028951552749999998 0.026665909499999998 0.031237196000000002 ZT12-15 0.21909830150000004 0.1293358245 0.30886077850000004 ZT16-19 0.455899415 0.43776536 0.47403346999999996 ZT20-23 0.2893246005 0.237263124 0.341386077