condition mean min max ZT0-3 6777.9 6777.9 6777.9 ZT4-7 19583.8 19583.8 19583.8 ZT8-11 18939.800000000003 18939.800000000003 18939.800000000003 ZT12-15 13692.599999999999 13692.599999999999 13692.599999999999 ZT16-19 5554.75 5554.75 5554.75 ZT20-23 2792.0 2792.0 2792.0