condition mean min max ZT0-3 139.632658 139.632658 139.632658 ZT4-7 82.074164 82.074164 82.074164 ZT8-11 56.522223 56.522223 56.522223 ZT12-15 74.1546735 74.1546735 74.1546735 ZT16-19 40.688907 40.688907 40.688907 ZT20-23 48.5435205 48.5435205 48.5435205