condition mean min max ZT0-3 811.446208 811.446208 811.446208 ZT4-7 468.296161 468.296161 468.296161 ZT8-11 778.0516540000001 778.0516540000001 778.0516540000001 ZT12-15 713.0820475 713.0820475 713.0820475 ZT16-19 1373.4141565 1373.4141565 1373.4141565 ZT20-23 1127.5491055 1127.5491055 1127.5491055