condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.323805563 0.1102813335 0.5373297925 ZT8-11 0.25262678025 0.205639844 0.2996137165 ZT12-15 0.574902589 0.4776984005 0.6721067775 ZT16-19 1.32754812575 1.0670530645 1.588043187 ZT20-23 0.57906968375 0.39179920049999994 0.766340167