condition mean min max ZT0-3 0.32275925 0.1593355 0.486183 ZT4-7 0.4877745 0.4877745 0.4877745 ZT8-11 0.4851565 0.4851565 0.4851565 ZT12-15 0 0 0 ZT16-19 0.53128 0.53128 0.53128 ZT20-23 0.7458994999999999 0.7458994999999999 0.7458994999999999