condition mean min max ZT0-3 7438.001288 7438.001288 7438.001288 ZT4-7 6475.501405999999 6475.501405999999 6475.501405999999 ZT8-11 5688.9453765 5688.9453765 5688.9453765 ZT12-15 6566.609344 6566.609344 6566.609344 ZT16-19 6670.581314999999 6670.581314999999 6670.581314999999 ZT20-23 6423.882507 6423.882507 6423.882507