The risk of weight gain was inversely associated with age ( adjusted odds ratio ( ORadj ) = 0.97 , 95 % confidence interval ( 95 % CI ) 0.95-0 .99 ) , Hispanic ethnicity ( ORadj = 0.30 , 95 % CI 0.13-0 .68 ) , and overweight ( ORadj = 0.11 , 95 % CI 0.05-0 .23 ) or obese ( ORadj = 0.03 , 95 % CI 0.02-0 .07 ) status at diagnosis and positively associated with time elapsed since diagnosis ( ORadj = 1.19 / year , 95 % CI 1.04-1 .36 ) .