CategoryOil ever** (N=1908)Oil Never** (N=1584)
Acute respiratory conditions (ICD-9:460–466)304397276.54233327571.141.07 (0.91 to 1.27)
Chronic respiratory conditions (ICD-9:471–474, 476-
478, 490–496, 506, 508)
289400772.12184335754.81 1.32 (1.09 to 1.58)
Asthma (ICD-9:493)4143239.491835535.07 1.83 (1.05 to 3.19)
COPD (ICD-9:490–496)92425221.6455350015.711.36 (0.97 to 1.89)
Headaches and migraines (ICD-9:339, 346)79427018.5053350915.101.35 (0.95 to 1.92)
Neurological conditions, excluding headaches/migraines
(ICD-9:337, 341, 345, 348, 349)
1643403.69935642.531.48 (0.66 to 3.36)
Dermal conditions (ICD-9:690–692, 694, 701, 702, 709)305400276.21211333163.35 1.21 (1.01 to 1.44
  • *Responders’ follow-up period begins on the deployment end date. Non-responders’ follow-up period begins on the median of all responder

  • †Excludes medical encounters that occurred after a participant exited the USCG.

  • ‡IR: incidence rate based on searching health encounter data dating back to October 2007 and excluding any cases identified prior to start of follow-up. Expressed as incidence per 1000 person years.

  • §In responder/non-responder analysis, rate ratio was adjusted for age for respiratory, asthma, COPD, neurological and dermal conditions. Rate ratio was adjusted for age and gender for headaches and migraines.

  • ¶In oil ever/never analysis, rate ratio was adjusted for age and smoking for respiratory, asthma and COPD, age and gender for headaches and migraines, and age only for neurological and dermal conditions.

  • **Ever versus never exposed to oil as reported in surveys 1 and 2. Bold indicates statistically significant RR.

  • Bold typeface indicates statistical significance.

  • COPD, chronic obstructive pulmonary disease; ICD, International Classification of Diseases; P-Y, ‘person years’; RR, relative risks; USCG, US Coast Guard.