10.20am: Mr Davis said Allison had told her best friend she was having trouble with depression as far back as 1997 when, while travelling through South America, she experienced it as a side effect of taking malaria medication.
He said she later suffered it during the births of her three children.
In 2009, he said Allison confided to her best friend that she had taken medication for depression.
"So, in 2009, Allison Baden-Clay is effectively telling you she has suffered depression for 12 years," Mr Davis said.
Witness Kerry-Ann Walker said there were only intermittent bouts of depression during that time.
"She had good days and bad days," she said.
"It was never severe enough that it affected her taking care of the children."
Mr Davis said there was plenty to show Allison had been suffering from depression for many years.
"Some days she couldn't go out of the house, so some days she wasn't able to function," he said.
"She could always function," Ms Walker argued.
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