condition mean min max ZT0-3 0.170288 0.0 0.340576 ZT4-7 1.042465 1.042465 1.042465 ZT8-11 0.684553 0.684553 0.684553 ZT12-15 0 0 0 ZT16-19 2.687455 2.687455 2.687455 ZT20-23 0.0 0.0 0.0