condition mean min max ZT0-3 0.0159935 0.0 0.031987 ZT4-7 0.220369 0.220369 0.220369 ZT8-11 0.1263595 0.1263595 0.1263595 ZT12-15 0 0 0 ZT16-19 0.0629665 0.0629665 0.0629665 ZT20-23 0.0314471 0.0314471 0.0314471