You will be presented with a citation segment from the section of a research paper. Classify the intent behind this citation by choosing from one of the following categories:

- Method: Cites the paper for its methodology or procedure.
- Background: Cites the paper to provide background information.
- Result: Cites the paper for its findings or results.

Your answer should be a single word from the following list of options: ["Method", "Background", "Result"]. Do not include any other text in your response.

Citation sentence:

On the other hand, according to a recent meta-analysis (based on 29 studies of 19 bird species), it is males that suffer from higher mortality when the parental effort is increased; this may be because males tend to adjust their investment according to brood size while females are working on their maximum level irrespective of the current brood size (Santos and Nakagawa 2012).
Background