condition mean min max ZT0-3 0.0901627 0.0901627 0.0901627 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0168355 0.0168355 0.0168355 ZT16-19 0.01492775 0.01492775 0.01492775 ZT20-23 0.22768850000000002 0.22768850000000002 0.22768850000000002