condition mean min max ZT0-3 34.229622 34.229622 34.229622 ZT4-7 101.281835 101.281835 101.281835 ZT8-11 132.27655950000002 132.27655950000002 132.27655950000002 ZT12-15 160.9252385 160.9252385 160.9252385 ZT16-19 54.218637 54.218637 54.218637 ZT20-23 24.978575499999998 24.978575499999998 24.978575499999998