condition mean min max ZT0-3 1.17864570225 0.89858066 1.4587107445 ZT4-7 6.12468576625 3.6250379529999996 8.6243335795 ZT8-11 13.49599336 11.266741205 15.725245515000001 ZT12-15 20.0757116 19.654958135 20.496465065000002 ZT16-19 15.8498685 15.835562955 15.864174045 ZT20-23 12.4677105245 10.823987589 14.11143346