condition mean min max ZT0-3 9.918354 9.918354 9.918354 ZT4-7 11.171208 11.171208 11.171208 ZT8-11 10.168749 10.168749 10.168749 ZT12-15 9.514706499999999 9.514706499999999 9.514706499999999 ZT16-19 10.186618500000002 10.186618500000002 10.186618500000002 ZT20-23 9.4274265 9.4274265 9.4274265