condition mean min max ZT0-3 50.34365 50.34365 50.34365 ZT4-7 35.406549999999996 35.406549999999996 35.406549999999996 ZT8-11 34.89745 34.89745 34.89745 ZT12-15 38.1215 38.1215 38.1215 ZT16-19 52.8605 52.8605 52.8605 ZT20-23 51.4178 51.4178 51.4178