condition mean min max ZT0-3 0.33866869149999995 0.0 0.6773373829999999 ZT4-7 0.46807154925000005 0.44190963400000005 0.49423346450000005 ZT8-11 0.36778213174999996 0.3363639985 0.399200265 ZT12-15 0.20127850349999998 0.16658852 0.23596848699999998 ZT16-19 0.18411673275 0.09404056599999999 0.27419289950000003 ZT20-23 0.51812391775 0.33094282249999996 0.705305013