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> 警察庁によると、このテストで「認知症」という脳の病気の可能性があると言われた人は約１年で５万７０９９人いました。
> **そして、この中の１８９２人が、医者が調べて認知症だとわかりました。**  
>  According to the police, in this test, in around 1 year, there were 57099
> people who were told that they might have a brain disease called dementia.
> 1892 of these people _knew they had dementia because a doctor had tested
> them_.

I'm having trouble understanding the sentence in bold. The translation is my
best guess. My understanding of 分かる is a bit shaky. Does this sentence suggest
that the 1892 people already knew they had dementia **before** they took the
police test, or does it imply that those people went to the doctor **after**
the police test and were then confirmed as having dementia? (putting aside the
fact that a person diagnosed with dementia might still not _know_ they have
dementia).
CC BY-SA 4.0
2018-06-09T16:07:59.367
59338
2018-06-09T16:51:57.243
7944
question
reading-comprehension
Understanding 分かる in this sentence
This わかる is close to 判明する(become clear) rather than "know". So
この中の１８９２人が、医者が調べて認知症だとわかりました means "It became clear that 1892 of these people
had dementia because a doctor had tested them."

We can't know why they took police test and when they knew they had dementia
just from this sentence.
CC BY-SA 4.0
2018-06-09T16:51:57.243
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2018-06-09T16:51:57.243
7320
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answer