condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.03085835 0.03085835 0.03085835 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0294055 0.0294055 0.0294055 ZT16-19 0.02544865 0.02544865 0.02544865 ZT20-23 0.02467165 0.02467165 0.02467165