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. Author manuscript; available in PMC: 2016 May 1.
Published in final edited form as: J Head Trauma Rehabil. 2015 May-Jun;30(3):150–159. doi: 10.1097/HTR.0000000000000105

TABLE 1.

Annual average frequencies of patient characteristics for traumatic brain injury–related hospitalizations and ED visits with CRs with 95% CIs comparing data from the NHDS with the HCUP-NIS and data from the NHAMCS with the HCUP-NEDS—United States, 2006–2010

Hospitalizations
ED visits
NHDS HCUP-NIS CR (95% CI) NHAMCS HCUP-NEDS CR (95% CI)
Sex
 Male 172 252 178 941 0.96 (0.87–1.06) 1 020 043 983 147 1.04 (0.90–1.17)
 Female 116 910 114 454 1.02 (0.93–1.11) 774 774 824 902 0.94 (0.81–1.07)
 Unknown 1249 a
Age group
 0–4 y 13 382 11 341 1.18 (0.90–1.46) 343 789 262 614 1.31 (1.07–1.55)b
 5–14 y 13 475 12 219 1.10 (0.86–1.34) 289 743 253 826 1.14 (0.91–1.38)
 15–24 y 40 673 41 663 0.98 (0.83–1.12) 364 665 372 139 0.98 (0.83–1.13)
 25–44 y 59 687 59 391 1.00 (0.87–1.14) 340 808 378 367 0.90 (0.75–1.06)
 45–64 y 64 970 65 303 0.99 (0.88–1.11) 242 524 269 489 0.90 (0.76–1.04)
 65+ y 96 974 104 193 0.93 (0.85–1.01) 213 288 272 280 0.78 (0.64–0.92)b
 Age not specified 534 171
ICD-9-CM nature of injury code range
 800–801, 803–804 (fractures of the skull) 64 492 63 049 1.02 (0.89–1.16) 30 223c 41 162 d
 850.0–854.1 (intracranial injury) 190 831 197 648 0.97 (0.87–1.06) 419 962 540 691 0.78 (0.65–0.90)b
 995.55 (shaken baby syndrome) e 470 d 242
 959.01 (unspecified head injury) 35 548 36 676 0.97 (0.85–1.09) 1 383 410 1 251 376 1.11 (0.95–1.26)
Totalf 289 162 294 644 0.98 (0.90–1.06) 1 794 817 1 808 886 0.99 (0.87–1.11)

Abbreviations: CI indicates confidence interval; CR, comparability ratio; ED, emergency department; HCUP-NEDS, Healthcare Cost and Utilization Project Nationwide Emergency Department Sample; HCUP-NIS, Healthcare Cost and Utilization Project Nationwide Inpatient Sample; ICD-9-CM, International Classification of Diseases, Ninth Revision, Clinical Modification; NHAMCS, National Hospital Ambulatory Medical Care Survey; NHDS, National Hospital Discharge Survey.

a

The relative standard error was more than 30% or the standard error = 0; the value of the estimate was considered unreliable and was not reported.

b

The 95% confidence interval did not include 1. Estimates were not comparable between data sets.

c

Sample size was 30–59; the value of the estimate was reported but should not be assumed reliable.

d

Comparability ratios were not calculated if estimate was considered unreliable or potentially unreliable.

e

Sample size was less than 30 or the relative standard error was more than 30%; the value of the estimate was considered unreliable and was not reported.

f

Category-level code counts do not directly sum to the total counts, as records may include more than 1 traumatic brain injury–related diagnosis. Total counts include optic nerve injuries that were rare and present only in HCUP-NIS and HCUP-NEDS.