condition mean min max ZT0-3 20.0273 18.03765 22.01695 ZT4-7 12.065415 12.065415 12.065415 ZT8-11 13.67175 13.67175 13.67175 ZT12-15 0 0 0 ZT16-19 15.24655 15.24655 15.24655 ZT20-23 21.7553 21.7553 21.7553