condition mean min max ZT0-3 86.008557 86.008557 86.008557 ZT4-7 51.001348 51.001348 51.001348 ZT8-11 45.308068 45.308068 45.308068 ZT12-15 49.7834195 49.7834195 49.7834195 ZT16-19 40.351912999999996 40.351912999999996 40.351912999999996 ZT20-23 41.871832999999995 41.871832999999995 41.871832999999995