condition mean min max ZT0-3 7.985676429 7.335831600999999 8.635521257 ZT4-7 7.11555429 6.925183023000001 7.305925556999999 ZT8-11 8.11433322875 6.574428799 9.654237658500001 ZT12-15 12.40431353425 12.294019192 12.5146078765 ZT16-19 9.792262021500001 9.350747412 10.233776631000001 ZT20-23 7.23615853775 6.633312468 7.8390046075