condition mean min max ZT0-3 16.995140014999997 13.849154949999999 20.14112508 ZT4-7 12.1523447125 11.207158844999999 13.09753058 ZT8-11 11.093504241249999 10.6613751775 11.525633305 ZT12-15 10.58500597775 10.519302386 10.6507095695 ZT16-19 12.2551140115 9.826925408000001 14.683302614999999 ZT20-23 19.3600160425 18.233611054999997 20.486421030000002