Table 1.

List of variables available for study.

All IBD Visits [CD - ICD9-CM: 555.0, 555.1 and 555.9 (including all subgroup codes) or UC [ICD9-CM: 556 (including all subgroup codes)] medical encounters
Date of medical encounter
All ICD-9 codes affiliated with medical encounter
Visit type (e.g., inpatient or outpatient)
All IBS (ICD9-CM: 564.1), or IGE (ICD9-CM: 001 [all subgroups], 003.0, 003.9, 004 [all subgroups], 008.0, 008.43, 008.44, 008.8, 005.4, 008.47, 008.49, 008.5, 009.0–3, 005.8, 005.9, 006.0, 006.1, 006.2, 006.9, 007 [all subgroups], 008.6 [all subgroups]) medical encounters prior and subsequent to initial IBD diagnosis
Date of medical encounter
All ICD-9 codes affiliated with medical encounter
Visit type (e.g., inpatient or outpatient)
All medical encounters in which a procedural code for colonoscopy was utilized
Date of medical encounter
All ICD-9 and CPT codes affiliated with medical encounter
Visit type (e.g., inpatient or outpatient)
All operational deployments
Date of deployment
Duration of deployment
Operation
Demographic Variables
Year of birth
Gender
Race
Education level
Military Rank
Marital status
Branch of service