condition mean min max ZT0-3 31.767324999999996 26.395249999999997 37.139399999999995 ZT4-7 21.79335 21.79335 21.79335 ZT8-11 21.7525 21.7525 21.7525 ZT12-15 0 0 0 ZT16-19 32.2829 32.2829 32.2829 ZT20-23 24.25195 24.25195 24.25195