condition mean min max ZT0-3 33.14045 26.4709 38.667699999999996 ZT4-7 55.436499999999995 55.436499999999995 55.436499999999995 ZT8-11 38.12095 38.12095 38.12095 ZT12-15 36.156392499999995 32.11225 40.200534999999995 ZT16-19 55.470600000000005 55.470600000000005 55.470600000000005 ZT20-23 26.409799999999997 26.409799999999997 26.409799999999997