. 2010 Dec 1;33(12):1615–1622. doi: 10.1093/sleep/33.12.1615

Table 2.

Adjusted mean sleep duration (h) at follow-up (July 2004–January 2006) of Millennium Cohort participants

Characteristics	Mean sleep duration at follow-up n = 38,435
Characteristics	Hours	P-value
Model A^*
Deployment Status^†		< 0.01
Non Deployed	6.56^a
Post deployment	6.47^b
Deployed	6.46^b
Model B^‡
Deployment status^†		0.84
Non deployed	6.33^a
Post deployment	6.33^a
Deployed	6.31^a
Combat^§^¶		< 0.01
No	6.40^a
Yes	6.25^b
Posttraumatic stress disorder^¶	< 0.01
No	6.54^a
Yes	6.11^b
Depression^¶		0.07
No	6.37^a
Yes	6.29^a
Anxiety^¶		< 0.01
No	6.44^a
Yes	6.21^b
Panic^¶		0.21
No	6.36^a
Yes	6.29^a

Adjusted for sex, birth year, race/ethnicity, education, marital status, service branch, service component, pay grade, occupation, general health, life stressors, baseline sleep duration, sleep apnea, BMI, smoking status, problem drinking, and baseline symptoms of PTSD, depression, anxiety, and panic.

^†

At submission of follow-up survey, those in the nondeployed group had not yet deployed, those in the post deployment group had completed at least one deployment, and those in the deployed group were currently deployed.

^‡

Adjusted for all variables displayed in Model A and combat, follow-up symptoms of PTSD, depression, anxiety, and panic.

^§

At follow-up, had personally experienced combat or combat-like situation such as witnessing a person's death due to war, disaster or tragic event.

^¶

Assessed at follow-up.