Characteristics of patients with and without HSV (unweighted n=8 264 076, weighted n=40 653 030)*
| Variable | Without HSV (n=8 140 845) | With HSV (n=123 231) | P values |
| Age, years | |||
| 15–19 | 749 284 (9.2) | 7551 (6.1) | <0.001† |
| 20–35 | 6 469 031 (79.5) | 97 636 (79.2) | |
| >35 | 922 530 (11.4) | 18 044 (14.6) | |
| Race | |||
| White | 3 566 655 (52.4) | 58 751 (54.8) | <0.001 |
| Black | 918 059 (13.5) | 26 618 (24.8) | |
| Hispanic | 1 594 033 (23.2) | 14 712 (13.7) | |
| Asian or Pacific Islander | 357 045 (5.2) | 2418 (2.2) | |
| Native American | 56 508 (0.8) | 617 (0.6) | |
| Others | 335 393 (5.0) | 4030 (3.8) | |
| Income | |||
| US$1–US$38 999 | 2 179 616 (27.3) | 33 965 (28.1) | 0.063 |
| US$39 000–US$47 999 | 2 025 955 (25.4) | 29 538 (24.3) | |
| US$48 000– US$62 999 | 1 973 328 (24.7) | 30 314 (25.0) | |
| US$63 000 or more | 1 807 282 (22.6) | 27 416 (22.6) | |
| Insurance | |||
| Uninsured | 505 763 (6.2) | 5721 (4.6) | <0.001† |
| Insured | 7 621 194 (93.8) | 117 310 (95.4) | |
| Location | |||
| Rural | 891 349 (11.1) | 9704 (7.9) | <0.001† |
| Urban | 7 204 245 (88.9) | 112 642 (92.1) | |
| Comorbidity | |||
| DM | 69 232 (0.9) | 1438 (1.2) | <0.001† |
| Gestational DM | 461 749 (5.7) | 7322 (6.0) | <0.001† |
| Obesity | 288 517 (3.6) | 7157 (5.8) | <0.001† |
| Alcohol abuse | 8874 (0.1) | 379 (0.3) | <0.001† |
| Smoking | 170 987 (2.1) | 4915 (4.0) | <0.001† |
| Multiple gestation | 154 040 (1.9) | 2116 (1.7) | <0.001† |
Data presented as unweighted count (weighted %).
*Data were weighted according to the National Inpatient Sample protocol.
†Significant difference between the two groups, p<0.05.
DM, diabetes mellitus; HSV, herpes simplex virus.