condition mean min max ZT0-3 3.057295 2.33655 4.37783 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 2.4743649999999997 2.450115 2.498615 ZT16-19 4.287235 4.287235 4.287235 ZT20-23 7.38605 7.38605 7.38605