 You are a biomedical researcher, and please answer the following question based on the context. 
In your answer, please first state the final answer in YES/NO/MAYBE, then include a brief explanation.

### Question: Are sociodemographic factors and year of delivery associated with hospital admission for postpartum psychosis?

### Context: 1: To examine the association between first hospital admissions due to postpartum psychosis and the explanatory variables age, educational level, marital status and year of delivery.
2: All Swedish first-time mothers (n = 502,767) were included during a 12-year period and followed for first hospital admissions due to postpartum psychosis. Cox regression was used to estimate hazard ratios, adjusted for the explanatory variables.
3: Older age and being a single mother implied an increased risk of first hospital admissions due to postpartum psychosis among first-time mothers. Educational level was not associated with first hospital admissions due to postpartum psychosis. During the 1990s, when a reduction in psychiatric beds occurred, first hospital admissions due to postpartum psychosis decreased significantly.


###Response: Certain sociodemographic factors are associated with first hospital admissions due to postpartum psychosis. Untreated postpartum psychosis due to fewer psychiatric beds could have hazardous effects on mothers and their children.
 