condition mean min max ZT0-3 13.233699999999999 13.233699999999999 13.233699999999999 ZT4-7 12.17975 12.17975 12.17975 ZT8-11 3.6064749999999997 3.6064749999999997 3.6064749999999997 ZT12-15 4.039085 4.039085 4.039085 ZT16-19 9.107195 9.107195 9.107195 ZT20-23 16.0398 16.0398 16.0398