condition mean min max ZT0-3 0.16851663333333333 0.0221909 0.412296 ZT4-7 0.0 0.0 0.0 ZT8-11 0.07312000041836851 0.07312000041836851 0.07312000041836851 ZT12-15 0.08953975 0.0 0.1790795 ZT16-19 0.0 0.0 0.0 ZT20-23 0.17203649999999998 0.17203649999999998 0.17203649999999998