condition mean min max ZT0-3 0.11529575 0.077587 0.1530045 ZT4-7 0.5498465 0.5498465 0.5498465 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.1524295 0.1524295 0.1524295 ZT20-23 0.46023500000000006 0.46023500000000006 0.46023500000000006