condition mean min max ZT0-3 15.1482 15.1482 15.1482 ZT4-7 8.49567 8.49567 8.49567 ZT8-11 7.215590000000001 7.215590000000001 7.215590000000001 ZT12-15 13.11185 13.11185 13.11185 ZT16-19 21.75685 21.75685 21.75685 ZT20-23 18.3371 18.3371 18.3371