Tens of thousands of workers participated in rescue, recovery, and cleanup activities at the World Trade Center (WTC) site in lower Manhattan after the terrorist attacks on September 11, 2001 (9/11). The collapse of the WTC resulted in the release of a variety of airborne toxicants. To date, respiratory symptoms and diseases have been among the most examined health outcomes in studies of WTC disaster workers. A systematic review of the literature on respiratory health outcomes was undertaken to describe the available information on new onset of respiratory symptoms and diseases among WTC disaster workers after September 11, 2001. Independent risk factors for respiratory health outcomes included being caught in the dust and debris cloud, early arrival at the WTC site, longer duration of work, and delaying mask and respirator use. Methodological challenges in epidemiologic studies of WTC disaster workers involved study design, exposure misclassification, and limited information on potential confounders and effect modifiers. In the 10 years after 9/11, epidemiologic studies of WTC disaster workers have been essential in investigating the respiratory health consequences of WTC exposure. Longitudinal studies along with continued medical surveillance will be vital in understanding the long-term respiratory burden associated with occupational WTC exposure. (Disaster Med Public Health Preparedness. 2011;5:S189–S196)

Objective: We present the longest follow-up, to date, of probable posttraumatic stress disorder (PTSD) after the 2001 terrorist attacks on the World Trade Center (WTC) in New York City firefighters who participated in the rescue/recovery effort.

Methods: We examined data from 11 006 WTC-exposed firefighters who completed 40 672 questionnaires and reported estimates of probable PTSD by year from serial cross-sectional analyses. In longitudinal analyses, we used separate Cox models with data beginning from October 2, 2001, to identify variables associated with recovery from or delayed onset of probable PTSD.

Results: The prevalence of probable PTSD was 7.4% by September 11, 2010, and continued to be associated with early arrival at the WTC towers during every year of analysis. An increasing number of aerodigestive symptoms (hazard ratio [HR] 0.89 per symptom, 95% confidence interval [CI] 0.86-.93) and reporting a decrease in exercise, whether the result of health (HR 0.56 vs no change in exercise, 95% CI 0.41-.78) or other reasons (HR 0.76 vs no change in exercise, 95% CI 0.63-.92), were associated with a lower likelihood of recovery from probable PTSD. Arriving early at the WTC (HR 1.38 vs later WTC arrival, 95% CI 1.12-1.70), an increasing number of aerodigestive symptoms (HR 1.45 per symptom, 95% CI 1.40–1.51), and reporting an increase in alcohol intake since September 11, 2001 (HR 3.43 vs no increase in alcohol intake, 95% CI 2.67-4.43) were associated with delayed onset of probable PTSD.

Conclusions: Probable PTSD continues to be associated with early WTC arrival even 9 years after the terrorist attacks. Concurrent conditions and behaviors, such as respiratory symptoms, exercise, and alcohol use also play important roles in contributing to PTSD symptoms.

(Disaster Med Public Health Preparedness. 2011;5:S197-S203)

Objective: Several studies have provided prevalence estimates of posttraumatic stress disorder (PTSD) related to the September 11, 2001 (9/11) attacks in broadly affected populations, although without sufficiently addressing qualifying exposures required for assessing PTSD and estimating its prevalence. A premise that people throughout the New York City area were exposed to the attacks on the World Trade Center (WTC) towers and are thus at risk for developing PTSD has important implications for both prevalence estimates and service provision. This premise has not, however, been tested with respect to DSM-IV-TR criteria for PTSD. This study examined associations between geographic distance from the 9/11 attacks on the WTC and reported 9/11 trauma exposures, and the role of specific trauma exposures in the development of PTSD.

Methods: Approximately 3 years after the attacks, 379 surviving employees (102 with direct exposures, including 65 in the towers, and 277 with varied exposures) recruited from 8 affected organizations were interviewed using the Diagnostic Interview Schedule/Disaster Supplement and reassessed at 6 years. The estimated closest geographic distance from the WTC towers during the attacks and specific disaster exposures were compared with the development of 9/11–related PTSD as defined by the Diagnostic and Statistical Manual, Fourth Edition, Text Revision.

Results: The direct exposure zone was largely concentrated within a radius of 0.1 mi and completely contained within 0.75 mi of the towers. PTSD symptom criteria at any time after the disaster were met by 35% of people directly exposed to danger, 20% of those exposed only through witnessed experiences, and 35% of those exposed only through a close associate’s direct exposure. Outside these exposure groups, few possible sources of exposure were evident among the few who were symptomatic, most of whom had preexisting psychiatric illness.

Conclusions: Exposures deserve careful consideration among widely affected populations after large terrorist attacks when conducting clinical assessments, estimating the magnitude of population PTSD burdens, and projecting needs for specific mental health interventions.

(Disaster Med Public Health Preparedness. 2011;5:S205-S213)

Objective: Hurricane Katrina highlighted both the crucial role of first responders in times of disaster and the resultant stress on them and their families. The primary objective of this study was to describe the mental health status and symptoms of first responders in the New Orleans area. We further hypothesized that given the extent of the disaster and slowness of recovery, symptoms of posttraumatic stress and depression would not decrease after the first-year anniversary of Hurricane Katrina.

Methods: A total of 1382 first responders, including respondents from police, fire, emergency medical services, and city workers, participated in this longitudinal study. The first screening was conducted between 6 and 9 months after Hurricane Katrina and the second round of data collection was conducted 13 to 18 months after the hurricane. A subsample of the respondents (n = 87) were matched at both time points, which allowed for paired sample comparisons. We measured all of the respondents' levels of traumatic experiences, alcohol use, partner conflict, requests for services, posttraumatic stress, and depression.

Results: More than one-quarter of the first responders reported the following traumatic experiences: witnessed injury or death (70%); damage to home (93%); injury to a friend (25%); and previous loss or trauma (30%). Data also revealed that at least 10% of the respondents had significant levels of posttraumatic stress symptoms; 25% of the participants reported significant levels of depression; and more than 40% reported increased alcohol use and conflict with partner (41%). A statistically significant decrease in the symptoms of posttraumatic stress or depression was not found within 18 months of Hurricane Katrina.

Conclusions: Results suggest that the severity of the traumas experienced from both the impact of Hurricane Katrina and the subsequent recovery has important mental health implications for first responders. Reports of symptoms of anxiety or depression should be attended to so as to prevent increasing symptoms that could negatively affect the first responder and his or her family. These findings highlight the importance of not only providing mental health services for first responders but also having adequate plans in place before natural or technological disasters strike.

(Disaster Med Public Health Preparedness. 2011;5:S214-S219)

Objective: The 1994 earthquake that struck Northridge, California, led to the closure of the Veterans Health Administration Medical Center at Sepulveda. This article examines the earthquake's impact on the mental health of an existing cohort of veterans who had previously used the Sepulveda Veterans Health Administration Medical Center.

Methods: From 1 to 3 months after the disaster, trained interviewers made repeated attempts to contact participants by telephone to administer a repeated measures follow-up design survey based on a survey that had been done preearthquake. Postearthquake data were obtained on 1144 of 1800 (64%) male veterans for whom there were previous data. We tested a predictive latent variable path model of the relations between sociodemographic characteristics, predisaster physical and emotional health measures, and postdisaster emotional health and perceived earthquake impact.

Results: Perceived earthquake impact was predicted by predisaster emotional distress, functional limitations, and number of health conditions. Postdisaster emotional distress was predicted by preexisting emotional distress and earthquake impact. The regression coefficient from earthquake impact to postearthquake emotional distress was larger than that of the stability coefficient from preearthquake emotional distress. Postearthquake emotional distress also was affected indirectly by preearthquake emotional distress, health conditions, younger age, and lower socioeconomic status.

Conclusions: The postdisaster emotional health of veterans who experienced greater earthquake impact would have likely benefited from postdisaster intervention, regardless of their predisaster emotional health. Younger veterans and veterans with generally poor physical and emotional health were more vulnerable to greater postearthquake emotional distress. Veterans of lower socioeconomic status were disproportionately likely to experience more effects of the disaster because they had more predisaster emotional distress, more functional limitations, and a greater number of health conditions. Because many veterans use non–Department of Veterans Affairs (VA) health care providers for at least some of their health needs, future disaster planning for both VA and non-VA providers should incorporate interventions targeted at these groups.

(Disaster Med Public Health Preparedness. 2011;5:S220-S226)

Background: Identifying individuals at risk for mental health problems after a disaster often involves assessing potentially traumatic exposures inherent to the disaster. Survivors of disasters also may have been exposed, both before and during the event, to trauma not directly related to the disaster. A substantial literature suggests exposure to interpersonal violence may have more severe negative outcomes than exposure to non-violent events; however, it is unclear whether violent vs nonviolent exposures before and during a disaster have differential effects on postdisaster psychological functioning.

Methods: We examined the associations of violent and nonviolent exposures before and during Hurricane Katrina with postdisaster psychological functioning in a sample of male military veterans.

Results: Violent and nonviolent exposures post-Hurricane Katrina as well as pre-Katrina violent exposures were significantly associated with symptoms of posttraumatic stress disorder, panic, and generalized anxiety disorder more than 2 years after the storm. Moreover, veterans who reported violent exposures pre-Katrina were more than 4 times more likely to have reexperienced interpersonal violence during Katrina than those who did not report such exposures.

Conclusions: Results suggest assessing disaster-specific experiences in addition to predisaster interpersonal violence may be important for identifying and triaging individuals at risk for postdisaster mental health problems.

(Disaster Med Public Health Preparedness. 2011;5:S227-S234)

Objective: To determine relations between sick leave use and the 2009 novel influenza A (H1N1) influenza pandemic among clinical and nonclinical staff in the Veterans Health Administration (VHA).

Methods: Aggregate sick leave use for all VHA employees was monitored in near-real time during the 2009 H1N1 influenza pandemic and compared with historical data from 2004 to 2008. The ratio of sick leave use between clinical and nonclinical staff was examined. An autoregressive integrated moving average model was used to assess whether the pandemic had a significant effect on sick leave use.

Results: The H1N1 influenza pandemic was associated with a significant effect on sick leave use in the VHA during the second wave of the pandemic. During this wave, the ratio of clinical to nonclinical sick leave use changed; clinical staff began taking more leave than nonclinical staff for 3 successive 2-week pay periods, with ratio measures of 1.004, 1.018, and 1.011, respectively. Using an autoregressive integrated moving average model with a pulse variable representing the pandemic, there was a significant effect on sick leave use. The average hours of sick leave used per full-time equivalent staff member per month increased by 0.3904 hours (P = .003) for clinical staff and 0.3898 hours (P = .01) for nonclinical staff over previous months during the first month of the second pandemic wave.

Conclusions: Work loss associated with a pandemic is an important indicator of disease activity and may be a more sensitive indicator of emerging strains than deaths. Monitoring sick leave use in near real time in a large national health care system may be an important early indicator of pandemic severity with practical implications that should be considered in addition to more traditional measures of influenza epidemic and pandemic severity.

(Disaster Med Public Health Preparedness. 2011;5:S235-S241)

Similar to the triaging of patients by health care workers, legal and public health professionals must prioritize and respond to issues of law and ethics in declared public health emergencies. As revealed by the 2009-2010 H1N1 influenza outbreak and other events, there are considerable inconsistencies among professionals regarding how to best approach these issues during a public health emergency. Our project explores these inconsistencies by attempting to assess how practitioners make legal and ethical decisions in real-time emergencies to further critical public health objectives. Using a fictitious scenario and interactive visualization environment, we observed real-time decision-making processes among knowledgeable participants. Although participants' decisions and perspectives varied, the exercise demonstrated an increase in the perception of the relevance of legal preparedness in multiple aspects of the decision-making process and some key lessons learned for consideration in future repetitions of the exercise and actual, real-time emergency events.

(Disaster Med Public Health Preparedness. 2011;5:S242-S251)