condition mean min max ZT0-3 0.506949499 0.47228383799999996 0.54161516 ZT4-7 0.02191848025 0.0 0.0438369605 ZT8-11 8.53729057575 0.724452848 16.3501283035 ZT12-15 22.021841317499998 19.19865896 24.845023675 ZT16-19 8.95948595425 6.616941368 11.3020305405 ZT20-23 1.50192188825 0.866440176 2.1374036005