condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.074654759 0.0 0.149309518 ZT8-11 0.270269148 0.0 0.540538296 ZT12-15 0.0 0.0 0.0 ZT16-19 0.04402721716666667 0.0 0.08805443433333333 ZT20-23 0.0 0.0 0.0