chalk them up to

Still Alice by LISA GENOVAを読んでいます。
She and you and your family and her colleagues probably disregarded any number of symptoms as fluke, or normal, or chalked them up to stress, not enough sleep, too much to drink, and on. This could'ved gone on easily for a year or tow or longer.
"chalked them up to" は12/19/2011に取り上げているので復習です。
・Farlex Dictionary of Idioms: To attribute something to something else (which is stated after "to").: They're a very young team, so we'll chalk this loss up to inexperience and nerves.
・Wiktionary: To attribute or account for something.: Chalk it up to fear that he didn't finish.