condition mean min max ZT0-3 21.747833333333332 8.8539 29.268099999999997 ZT4-7 5.3809000000000005 5.3809000000000005 5.3809000000000005 ZT8-11 38.05345 38.05345 38.05345 ZT12-15 109.960425 108.04235 111.8785 ZT16-19 87.75965 87.75965 87.75965 ZT20-23 65.35155 65.35155 65.35155