condition mean min max ZT0-3 49.438202955 42.595915160000004 56.28049075 ZT4-7 7.617217501 4.8483873299999996 10.386047672 ZT8-11 9.368005731 6.116656102 12.61935536 ZT12-15 12.59788889175 12.0721953085 13.123582475 ZT16-19 15.381131382500001 13.655875205 17.10638756 ZT20-23 26.7168954075 25.21667863 28.217112185