condition mean min max ZT0-3 5.418626269500001 5.375114928 5.462137611 ZT4-7 8.44506755675 6.6631219195 10.227013194 ZT8-11 20.0394155075 14.925139994999999 25.15369102 ZT12-15 21.987261535000002 21.131651015000003 22.842872054999997 ZT16-19 12.6252551975 12.26662596 12.983884435 ZT20-23 15.683440115 14.658289674999999 16.708590555