condition mean min max ZT0-3 0.9286268333333333 0.7136279999999999 1.0732975 ZT4-7 0.7143435 0.7143435 0.7143435 ZT8-11 1.0234345 1.0234345 1.0234345 ZT12-15 1.6715225 1.5829749999999998 1.76007 ZT16-19 1.148055 1.148055 1.148055 ZT20-23 1.839245 1.839245 1.839245