condition mean min max ZT0-3 0.419925 0.419925 0.419925 ZT4-7 0.5634335 0.5634335 0.5634335 ZT8-11 0.420192 0.420192 0.420192 ZT12-15 0.48775999999999997 0.48775999999999997 0.48775999999999997 ZT16-19 0.653336 0.653336 0.653336 ZT20-23 0.5228105000000001 0.5228105000000001 0.5228105000000001