condition mean min max ZT0-3 15.80805 11.125399999999999 19.49885 ZT4-7 10.003265 10.003265 10.003265 ZT8-11 11.5086 11.5086 11.5086 ZT12-15 20.629624999999997 16.17825 25.081 ZT16-19 16.27955 16.27955 16.27955 ZT20-23 24.8333 24.8333 24.8333