condition mean min max ZT0-3 1.71807925 1.3966135 2.039545 ZT4-7 0.3173175 0.3173175 0.3173175 ZT8-11 0.5349195 0.5349195 0.5349195 ZT12-15 0 0 0 ZT16-19 0.6444749999999999 0.6444749999999999 0.6444749999999999 ZT20-23 0.6723645 0.6723645 0.6723645