condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.023841833333333336 0.023841833333333336 0.023841833333333336 ZT8-11 0.052243000000000005 0.052243000000000005 0.052243000000000005 ZT12-15 0.00829885 0.0 0.0165977 ZT16-19 0.0 0.0 0.0 ZT20-23 0 0 0