condition mean min max ZT0-3 6.529205 6.529205 6.529205 ZT4-7 5.037145 5.037145 5.037145 ZT8-11 4.782055 4.782055 4.782055 ZT12-15 4.68102 4.68102 4.68102 ZT16-19 7.0904799999999994 7.0904799999999994 7.0904799999999994 ZT20-23 5.82607 5.82607 5.82607