condition mean min max ZT0-3 0.5700216666666666 0.0 1.710065 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 3.2625900000000003 3.2625900000000003 3.2625900000000003 ZT20-23 7.427625 7.427625 7.427625