BMC Medical Research Methodology

Table 1 Characteristics of Millennium Cohort Study Participants Who Provided a Meaningful Response for the Open-Ended Question

From: Application of latent semantic analysis for open-ended responses in a large, epidemiologic study

	Panel 1 Baseline		Panel 1 Follow-up		Panel 2 Baseline
Characteristic	All responders n= 77,042	Open-text responders^a n= 14,692	All responders n= 55,021	Open-text responders^a n= 8,937	All responders n= 31,096	Open-text responders^a n= 4,287
	%^b	%^b	%^b	%^b	%^b	%^b
Sex
Male	73.2	73.2	73.3	72.8	61.6	63.4
Female	26.8	26.8	26.7	27.2	38.4	36.6
Birth year
Before 1960	21.6	24.2	24.5	28.1	0.7	0.9
1960-1969	37.9	39.2	40.5	40.5	5.4	6.3
1970-1979	34.6	31.8	30.8	28.1	31.9	35.6
1980 or later	5.9	4.7	4.2	3.3	62.0	57.2
Education
High school or less	48.9	48.9	45.6	43.3	81.4	80.6
Some college	25.5	24.3	17.8	18.4	3.2	4.0
Bachelor's degree	16.5	16.7	22.1	22.7	12.3	12.7
Advanced degree	9.1	10.1	14.5	15.6	3.1	2.7
Marital status
Married	63.1	64.1	73.3	72.8	28.1	29.0
Not married	36.9	35.9	26.7	27.2	71.9	71.0
Race/ethnicity
White non-Hispanic	69.6	70.6	70.8	69.9	71.2	72.2
Black non-Hispanic	13.8	11.6	12.2	11.0	11.6	10.2
Other	16.7	17.8	16.9	19.1	17.1	17.6
2001-2007 deployment^c
No	57.6	61.4	56.3	56.1	42.3	38.4
Yes	42.5	38.6	43.6	43.9	57.7	61.6
Military rank
Enlisted	77.0	75.7	70.8	69.4	88.4	89.4
Officer	23.0	24.3	29.2	30.6	11.6	10.6
Service component
Reserve/Guard	43.0	36.8	53.4	51.3	40.0	36.7
Active duty	57.0	63.2	46.6	48.7	60.0	63.3
Branch of service
Air Force	29.0	25.7	30.3	24.7	26.6	17.9
Army	47.4	48.1	47.7	52.1	48.2	55.0
Navy/Coast Guard	18.5	20.6	18.1	18.8	16.9	16.8
Marine Corps	5.1	5.6	4.0	4.3	8.3	10.3
Occupational category
Others	69.9	69.0	69.4	68.3	72.5	72.0
Combat specialists	20.0	21.2	19.2	20.3	15.7	19.1
Heath care specialists	10.4	9.8	11.4	11.4	11.8	8.9
General health^d
Very good/excellent	59.0	48.9	55.3	45.6	54.3	41.4
Good	30.3	35.1	34.5	37.4	33.1	37.8
Fair/poor	7.7	13.3	8.9	15.9	8.9	17.7
Missing	3.0	2.7	1.3	1.0	3.6	3.1

^a Includes participants who had a meaningful response to the open-ended question, "Do you have any concerns that are not covered in this survey that you would like to share?"
^b Percentages were rounded and may not sum to 100.
^c Any deployment in support of the wars in Iraq and Afghanistan September 2001-October 2007.
^d Self-reported general health from the question, "In general, would you say your health is excellent, very good, good, fair, or poor?"

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