condition mean min max ZT0-3 11.934914 11.934914 11.934914 ZT4-7 9.33962 9.33962 9.33962 ZT8-11 9.911414 9.911414 9.911414 ZT12-15 24.054529 24.054529 24.054529 ZT16-19 11.588110499999999 11.588110499999999 11.588110499999999 ZT20-23 37.275217999999995 37.275217999999995 37.275217999999995