For those with cancers 20 mm or less in diameter , the 10-year rates were 88 % ( 95 % confidence interval , 82-93 ) versus 84 % ( 95 % confidence interval , 73-96 ) ( P = .45 ) , and Cox survival analysis showed no significant difference between sublobar resection and lobectomy using either approach ( P = .42 and P = .52 , respectively ) .