condition mean min max ZT0-3 0.02636285 0.02603135 0.02669435 ZT4-7 0.2969045 0.2969045 0.2969045 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.02627395 0.02627395 0.02627395 ZT20-23 0.0262438 0.0262438 0.0262438