condition mean min max ZT0-3 0.4654561085 0.459901865 0.471010352 ZT4-7 0.8029315125 0.5383778690000001 1.067485156 ZT8-11 1.779677058 1.2705895685000002 2.2887645475 ZT12-15 3.19599790825 2.1550574739999995 4.2369383425 ZT16-19 4.057440386 3.7793477145 4.335533057499999 ZT20-23 4.293743114 4.242290957 4.345195271000001