condition mean min max ZT0-3 59.345382 59.345382 59.345382 ZT4-7 69.44425 69.44425 69.44425 ZT8-11 161.985397 161.985397 161.985397 ZT12-15 141.9027385 141.9027385 141.9027385 ZT16-19 87.0632995 87.0632995 87.0632995 ZT20-23 48.2149835 48.2149835 48.2149835