condition mean min max ZT0-3 0.9586246666666667 0.70653 1.23142 ZT4-7 0.0 0.0 0.0 ZT8-11 0.5776195 0.5776195 0.5776195 ZT12-15 0.9655590000000001 0.7462225 1.1848955 ZT16-19 1.0865649999999998 1.0865649999999998 1.0865649999999998 ZT20-23 1.42198 1.42198 1.42198