condition mean min max ZT0-3 231.699718 231.699718 231.699718 ZT4-7 365.81451949999996 365.81451949999996 365.81451949999996 ZT8-11 258.496429 258.496429 258.496429 ZT12-15 244.6527475 244.6527475 244.6527475 ZT16-19 181.944332 181.944332 181.944332 ZT20-23 158.68766349999999 158.68766349999999 158.68766349999999