Statistics Canada says one in three Canadians report they have had mental-health or substance-abuse problems.
The Canadian Community Health Survey released Wednesday found more than 9.1 million people over the age of 15 reported in 2012 having had a "major depressive episode, bipolar disorder, generalized anxiety disorder and abuse of/or dependence on alcohol, cannabis or other drugs" in their lifetime.
But officials from the Canadian Mental Health Association fear that mental-health and substance-abuse issues are largely under-reported.
Quenneville also took issue that the survey didn't include certain groups known to have mental-health and drug problems, including aboriginals living on reserves, prisoners or full-time Canadian Forces members.
However, Quenneville said the most alarming statistic is that Canadian youth were found to have suffered from mood disorders or substance abuse more than any other age group.
"The fact that we're not doing enough for the young people really sticks out to us. We certainly see it. We do serve families in the community and that's critically important," she said.
More than 30% of Canadians aged 15 to 24 said they had suffered from mental or substance disorders in their lifetime. Nearly 19% said they had in the previous 12 months.
The survey also found about one in 10 Canadians said they had mental-health issues or problems with drugs in the last year.
Women were more likely to report mood or anxiety disorders, while men had higher rates of substance abuse.
In 2012, 17% of Canadians reported having accessed mental-health care in the past year. Two-thirds of them said their needs were met, but 12% reported they didn't get the help they needed and 21% said they required more treatment.
This is the first time Statistics Canada has compiled data on both mental health and substance abuse to correlate with World Health Organization guidelines, said Teresa Janz, senior analyst with StatsCan.
In 2002, Statistics Canada reported one in five Canadians had mental-health issues in their lifetime; however, it didn't include substance abuse.
About 25,100 people were surveyed in their homes and by phone.
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