condition mean min max ZT0-3 9.81361 9.81361 9.81361 ZT4-7 7.245945 7.245945 7.245945 ZT8-11 7.6213 7.6213 7.6213 ZT12-15 9.209475 9.209475 9.209475 ZT16-19 9.77973 9.77973 9.77973 ZT20-23 8.955760000000001 8.955760000000001 8.955760000000001