condition mean min max ZT0-3 36.108925 32.6686 39.54925 ZT4-7 57.559200000000004 57.559200000000004 57.559200000000004 ZT8-11 55.61535 55.61535 55.61535 ZT12-15 0 0 0 ZT16-19 53.8665 53.8665 53.8665 ZT20-23 49.40915 49.40915 49.40915