condition mean min max ZT0-3 0.02931975 0.02931975 0.02931975 ZT4-7 0.0361739 0.0361739 0.0361739 ZT8-11 0.00979465 0.00979465 0.00979465 ZT12-15 0.03588705 0.03588705 0.03588705 ZT16-19 0.15804400000000002 0.15804400000000002 0.15804400000000002 ZT20-23 0.0313455 0.0313455 0.0313455