condition mean min max ZT0-3 115.48885 115.48885 115.48885 ZT4-7 61.098393 61.098393 61.098393 ZT8-11 78.0382415 78.0382415 78.0382415 ZT12-15 84.3572205 84.3572205 84.3572205 ZT16-19 102.325831 102.325831 102.325831 ZT20-23 112.0737325 112.0737325 112.0737325