condition mean min max ZT0-3 12.464163333333333 9.67714 13.867550000000001 ZT4-7 8.311425 8.311425 8.311425 ZT8-11 7.504025 7.504025 7.504025 ZT12-15 10.11069 9.30397 10.91741 ZT16-19 12.15805 12.15805 12.15805 ZT20-23 17.335 17.335 17.335