condition mean min max ZT0-3 0.889721 0.889721 0.889721 ZT4-7 0.4889825 0.4889825 0.4889825 ZT8-11 0.39052 0.39052 0.39052 ZT12-15 0.6921035 0.6921035 0.6921035 ZT16-19 1.9299 1.9299 1.9299 ZT20-23 1.076075 1.076075 1.076075