condition mean min max ZT0-3 0.079703 0.053635 0.105771 ZT4-7 0.38010449999999996 0.38010449999999996 0.38010449999999996 ZT8-11 0.48897050000000003 0.48897050000000003 0.48897050000000003 ZT12-15 0 0 0 ZT16-19 0.3693265 0.3693265 0.3693265 ZT20-23 0.796725 0.796725 0.796725