condition mean min max ZT0-3 0.0115991 0.0 0.0231982 ZT4-7 0.0483922 0.0483922 0.0483922 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.0702435 0.0702435 0.0702435 ZT20-23 0.0 0.0 0.0