condition mean min max ZT0-3 3.5930975 2.88701 4.299185 ZT4-7 1.7797100000000001 1.7797100000000001 1.7797100000000001 ZT8-11 1.379115 1.379115 1.379115 ZT12-15 0 0 0 ZT16-19 2.811445 2.811445 2.811445 ZT20-23 2.57075 2.57075 2.57075