condition mean min max ZT0-3 0.154492449 0.0 0.308984898 ZT4-7 0.42650391825 0.37810743 0.4749004065 ZT8-11 0.2746370745 0.196748702 0.35252544700000005 ZT12-15 0.65587833875 0.533251848 0.7785048295 ZT16-19 0.8637761245 0.6561923805 1.0713598685 ZT20-23 2.90734977075 2.8483750695 2.966324472