condition mean min max ZT0-3 7.8428017915 7.438363053 8.247240530000001 ZT4-7 9.2126044745 9.132487611 9.292721338 ZT8-11 9.181714807833334 8.496517369333334 9.866912246333333 ZT12-15 9.734687784166667 9.725758283000001 9.743617285333334 ZT16-19 9.471788929999999 9.216996927 9.726580933 ZT20-23 7.600424567 7.207645083 7.993204051