condition mean min max ZT0-3 0.6085927499999999 0.41864899999999994 0.7985365 ZT4-7 0.631355 0.631355 0.631355 ZT8-11 1.4641199999999999 1.4641199999999999 1.4641199999999999 ZT12-15 0 0 0 ZT16-19 1.70806 1.70806 1.70806 ZT20-23 1.56637 1.56637 1.56637