condition mean min max ZT0-3 2.38929 2.0286299999999997 2.74995 ZT4-7 4.233625 4.233625 4.233625 ZT8-11 6.114990000000001 6.114990000000001 6.114990000000001 ZT12-15 0 0 0 ZT16-19 7.292705 7.292705 7.292705 ZT20-23 4.12112 4.12112 4.12112