Table 1.

Descriptive characteristics for patients (n = 509,945) and patient health questionnaire (PHQ9) responses (n = 1,228,308) included in the study between 1/1/2010 and 12/31/2012. Data are presented by suicidal ideation in the past two weeks. Positive suicidal ideation corresponded to PHQ item 9 response categories “several days”, “more than half the days”, or “nearly every day” and was self-reported in 16.6% of the PHQ9 responses.

	Individuals (n = 509,945)		PHQs (n = 1,228,308)		Positive Ideation 16.6%; (n = 204,405)
Female	73.7%	375,624	72.1%	885,110	14.9%	132,267
Age Category (years)
18–29	25.1%	128,059	20.2%	247,883	14.6%	36,275
30–44	31.1%	158,545	28.3%	347,728	14.9%	51,813
45–64	29.0%	147,645	34.9%	429,029	20.2%	86,661
65+	18.6%	94,881	16.6%	203,668	14.6%	29,656
Race/Ethnicity
Non-Hispanic white	52.9%	269,796	65.3%	801,715	17.9%	143,229
Hispanic	24.3%	123,996	15.9%	195,292	10.6%	20,707
Non-Hispanic black	7.8%	39,959	6.6%	81,159	16.5%	13,395
Asian	6.9%	35,273	4.9%	60,513	13.0%	7,866
Hawaiian/Pacific Islander	0.6%	2,925	0.5%	5,948	17.3%	1,028
Native American/Alaskan Native	0.8%	4,189	1.2%	14,400	21.3%	3,061
Other/Mixed/Unknown	6.6%	33,807	5.6%	69,281	21.8%	15,119
Visit Type Where PHQ9 Was Collected
Specialty Mental Health	22.6%	115,389	40.8%	500,751	24.0%	120,296
Primary Care	55.9%	284,970	36.0%	442,509	10.8%	47,654
Other	35.3%	179,776	23.2%	285,048	12.8%	36,455
Healthcare Site
1	22.3%	113,519	31.8%	390,484	20.9%	81,794
2	11.5%	58,682	22.6%	277,834	18.8%	52,213
3	12.4%	63,330	13.7%	168,636	23.6%	39,727
4	53.8%	274,414	31.9%	391,354	7.8%	30,671
Mental Health Treatment Status at Time of PHQ9
No Treatment	44.9%	228,723	23.5%	289,040	4.6%	13,177
Past Treatment	10.2%	51,908	5.5%	68,157	8.5%	5,823
New Current Treatment	24.7%	126,081	13.2%	161,531	21.8%	35,267
Ongoing Treatment	40.5%	206,605	57.8%	709,580	21.2%	150,138
Comorbidity Burden
None	64.5%	329,152	61.9%	760,312	15.7%	119,400
One	17.1%	87,343	15.7%	192,499	18.4%	35,370
Two or More	16.2%	82,484	15.3%	188,448	18.9%	35,547