condition mean min max ZT0-3 82.309431 82.309431 82.309431 ZT4-7 77.5905955 77.5905955 77.5905955 ZT8-11 88.919624 88.919624 88.919624 ZT12-15 78.05544 78.05544 78.05544 ZT16-19 75.99984900000001 75.99984900000001 75.99984900000001 ZT20-23 86.67078950000001 86.67078950000001 86.67078950000001