condition mean min max ZT0-3 2.2119575 1.58428 2.8396350000000004 ZT4-7 1.0044925 1.0044925 1.0044925 ZT8-11 1.46682 1.46682 1.46682 ZT12-15 0 0 0 ZT16-19 2.565225 2.565225 2.565225 ZT20-23 2.399635 2.399635 2.399635