condition mean min max ZT0-3 19.97055 18.485799999999998 21.4553 ZT4-7 17.8064 17.8064 17.8064 ZT8-11 10.02084 10.02084 10.02084 ZT12-15 0 0 0 ZT16-19 13.20575 13.20575 13.20575 ZT20-23 18.13315 18.13315 18.13315