Table IV.
Linkage status by match variable, overall linkage
| Linkeda N = 2,188 |
Unlinkeda N = 620 |
overall P | test (if not Χ2) | |
|---|---|---|---|---|
| Administrative variables | ||||
| Demographics | ||||
| Age, years(median(IQR)) | 6 (2–12) | 4 (0–12) | < 0.001 | ranksum |
| Admission year, mode(%) | 2008 (31) | 2010 (33) | 0.01 | |
| Discharge year, mode(%) | 2008 (31) | 2010 (35) | 0.001 | |
| Missing, n(%) | 7 (1) | 17 (1) | ||
| Male, n(%) | 1,373 (63) | 397 (64) | 0.54 | |
| Missing, n(%) | 1 (0) | 1 (0) | ||
| Insurance type, mode(%) | “government”, (44) | “government”, (49) | 0.17 | |
| Missing, n(%) | 260 (12) | 50 (8) | ||
| Race/Ethnicity, mode(%) | “white”, (54) | “white”, (63) | 0.003 | exact |
| Missing, n(%) | 128 (6) | 25 (4) | ||
| Hospital Course | ||||
| ICU admission, n(%) | 2,090 (96) | 585 (94) | 0.23 | |
| ICU days, median(IQR) | 4 (2–10) | 3 (2–8) | < 0.001 | ranksum |
| Hospital LOS, days (median(IQR)) | 8 (4–19) | 6 (3–13) | < 0.001 | ranksum |
| Missing, n(%) | 1 (0) | 5 (1) | ||
| Discharge disposition, mode(%) | “home”, (54) | “home”, (50) | < 0.001 | exact |
| Missing, n(%) | 23 (1) | 13 (2) | ||
| ICD-9-CM variables | ||||
| Injury Severity | ||||
| Injury Mechanism, mode(%) | “MVT”, (42) | “MVT”, (36) | 0.008 | |
| Injury Severity Score (ISS) | 17 (10–25) | 17 (10–25) | 0.009 | ranksum |
| Body region AIS scores | ||||
| Head, mode(%) | 4 (37) | 4 (42) | 0.01 | exact |
| Number Non-Head AIS ≠ 0, median(IQR) | 1 (0–3) | 1 (0–2) | < 0.001 | ranksum |
| Proceduresb | ||||
| Total count, median(IQR) | 1 (0–3) | 1 (0–2) | < 0.001 | ranksum |