condition mean min max ZT0-3 44.99195 43.8953 46.0886 ZT4-7 48.81055 48.81055 48.81055 ZT8-11 28.52805 28.52805 28.52805 ZT12-15 0 0 0 ZT16-19 47.46395 47.46395 47.46395 ZT20-23 56.32235 56.32235 56.32235