condition mean min max ZT0-3 0.02514 0.0 0.05028 ZT4-7 0.0262214 0.0262214 0.0262214 ZT8-11 0.026196 0.026196 0.026196 ZT12-15 0 0 0 ZT16-19 0.0252744 0.0252744 0.0252744 ZT20-23 0.02534515 0.02534515 0.02534515