condition mean min max ZT0-3 27.05955 27.05955 27.05955 ZT4-7 23.56045 23.56045 23.56045 ZT8-11 33.34365 33.34365 33.34365 ZT12-15 29.9459 29.9459 29.9459 ZT16-19 29.78585 29.78585 29.78585 ZT20-23 24.244950000000003 24.244950000000003 24.244950000000003