condition mean min max ZT0-3 16.81735 16.81735 16.81735 ZT4-7 15.32385 15.32385 15.32385 ZT8-11 12.953299999999999 12.953299999999999 12.953299999999999 ZT12-15 14.7898 14.7898 14.7898 ZT16-19 24.86815 24.86815 24.86815 ZT20-23 14.30565 14.30565 14.30565