Table 2. Giardiasis Outpatient Visits for Gastrointestinal Symptoms During 180-Day Study Window (N = 2995).
| Event Type | All Outpatients (N = 2995) | Age <18 y (n = 910) | Age 18–64 y (n = 2085) | PValuea | |||
|---|---|---|---|---|---|---|---|
| Total giardiasis or GI symptom visitsb | .01 | ||||||
| 1 | 932 | (31.1) | 305 | (33.5) | 627 | (30.1) | |
| 2 | 567 | (18.9) | 190 | (20.9) | 377 | (18.1) | |
| ≥3 | 1496 | (50.0) | 415 | (45.6) | 1081 | (51.9) | |
| Median (range) | 2 | (1–31) | 2 | (1–19) | 3 | (1–31) | |
|
| |||||||
| GI symptom visits before initial giardiasis diagnosis | .02 | ||||||
| 0 | 1428 | (47.7) | 457 | (50.2) | 971 | (46.6) | |
| 1 | 591 | (19.7) | 186 | (20.4) | 405 | (19.4) | |
| 2 | 441 | (14.7) | 134 | (14.7) | 307 | (14.7) | |
| ≥3 | 535 | (17.9) | 133 | (14.6) | 402 | (19.3) | |
| Median (range) | 1 | (0–15) | 0 | (0–14) | 1 | (0–15) | |
|
| |||||||
| Days from first symptom visit until initial diagnosisc | .23 | ||||||
| Same day | 1428 | (47.7) | 457 | (50.2) | 971 | (46.6) | |
| 1–7 d | 279 | (9.3) | 79 | (8.7) | 200 | (9.6) | |
| 8–30 d | 631 | (21.1) | 191 | (21.0) | 440 | (21.1) | |
| 31–90 d | 657 | (21.9) | 183 | (20.1) | 474 | (22.7) | |
| Median (range) | 2 | (0–90) | 0 | (0–90) | 3 | (0–90) | |
|
| |||||||
| Total days from first to last giardiasis or GI symptom visit | .45 | ||||||
| Same day | 932 | (31.1) | 305 | (33.5) | 627 | (30.1) | |
| 1–7 d | 305 | (10.2) | 88 | (9.7) | 217 | (10.4) | |
| 8–30 d | 566 | (18.9) | 165 | (18.1) | 401 | (19.2) | |
| 31–90 d | 902 | (30.1) | 269 | (29.6) | 633 | (30.4) | |
| ≥91 d | 290 | (9.7) | 83 | (9.1) | 207 | (9.9) | |
| Median (range) | 17 | (0–175) | 16 | (0–159) | 17 | (0–175) | |
Data are presented as No. (%) unless otherwise indicated.
Abbreviation: GI, gastrointestinal.
a
χ2 test of age group vs event type.
b
Includes visits for giardiasis (International Classification of Diseases, Ninth Revision, Clinical Modification code 007.1) and any of 83 GI-related conditions or symptoms.
c
“Same day” denotes outpatients whose first GI-related visit included a giardiasis diagnosis, with or without additional GI symptoms.