Risks of XXXX after twin births.

@entity1 @entity1204 @entity43 @entity0 @entity5344 @entity5
The concentrations of endogenous hormones differ between @entity1 with twin and singleton births, with a possible influence on the risk of @entity5 . We used the nationwide Swedish Family- @entity5 Database, including 30,409 @entity1 with a twin birth, to examine the subsequent risks of @entity5344 . Relative risks (RRs) were calculated in a log-linear Poisson regression model of @entity1 -years as offset. @entity5 data were retrieved from the Swedish @entity5 Registry; a total of 1010, 210, and 174 @entity1 were diagnosed with @entity5344 respectively, after a twin birth. A significant decrease in the risk of @entity0 was noted among @entity1 with a twin birth compared with @entity1 with a singleton birth (RR 0.85, 95% confidence interval (CI) 0.74-0.98). The protective effects were observed throughout the intervals after last pregnancy and they were strongest shortly after the last pregnancy in @entity1 who delivered a twin birth before 30 years of age. Twin birth did not change the risk of @entity1204 (1.08, 95% CI 0.79-1.47) but the RR was increased for @entity1 with the number of pregnancies > or =4 (1.39, 95% CI 1.11-1.76). The RR for @entity43 was 0.95 (95% CI 0.79-1.15). Our study showed that twin births significantly reduced the subsequent risk of @entity0 . However, the associations of twin births with @entity43 were not substantial.
