condition mean min max ZT0-3 0.69625497 0.5265202880000001 0.865989652 ZT4-7 0.27461657725 0.26133462100000004 0.2878985335 ZT8-11 7.840012079 1.8480202584999998 13.8320038995 ZT12-15 20.305434325 18.02649754 22.58437111 ZT16-19 10.098169869 7.789468246 12.406871491999999 ZT20-23 1.9248966622499997 1.02150941 2.8282839144999996