condition mean min max ZT0-3 69.672186 69.672186 69.672186 ZT4-7 186.4356115 186.4356115 186.4356115 ZT8-11 490.822337 490.822337 490.822337 ZT12-15 524.3486905 524.3486905 524.3486905 ZT16-19 692.285382 692.285382 692.285382 ZT20-23 621.778367 621.778367 621.778367