Table 2.
Comparison of ocular history and pretreatment by laboratory results (n=528).
| Laboratory-negative (n=271) | Laboratory-positive (n=257) | ||
|---|---|---|---|
| Continuous Variable | Mean (SD), Median (IQR) | Mean (SD), Median (IQR) | P-value |
| Symptom onset to presentation (days) | 18.7 (37.9), 6.0 (3.0–19.2) | 17.0 (31.4), 7.0 (3.0–16.0) | 0.551 |
| Number of antibiotics prescribed prior to presentation | 1.2 (1.1), 1.0 (0–2) | 0.9 (1.0), 1.0 (0–1) | <0.001 |
| # (column %) | # (column %) | P-value | |
| Cornea clinic | 200 (73.8) | 176 (68.5) | 0.210 |
| ESwab | 147 (54.2) | 109 (42.4) | 0.008 |
| Contact lens wear | 126 (46.5) | 121 (47.1) | 0.962 |
| Prior antibiotic treatment | 203 (74.9) | 164 (63.8) | 0.008 |
| Prior corticosteroids treatment | 66 (24.4) | 98 (38.3) | 0.001 |
| Prior eye penetrating trauma | 41 (15.1) | 27 (10.5) | 0.150 |
| Prior viral or neurotrophic keratitis | 28 (10.3) | 28 (10.9) | 0.933 |
| Outside referral | 158 (58.5) | 139 (54.3) | 0.374 |
| Referral time span | |||
| <7 days | 140 (53.6) | 124 (49.8) | |
| ≥7 days | 10 (3.8) | 11 (4.4) | 0.480 |
| Self | 24 (9.2) | 17 (6.8) | |
| Within UM system | 87 (33.3) | 97 (39.0) |
SD, standard deviation. IQR, interquartile range. UM, University of Michigan.