condition mean min max ZT0-3 0.48518978333333335 0.17601885 0.825605 ZT4-7 0.136998 0.136998 0.136998 ZT8-11 0.5306005 0.5306005 0.5306005 ZT12-15 1.10027375 0.9916525 1.208895 ZT16-19 1.17423 1.17423 1.17423 ZT20-23 0.758127 0.758127 0.758127