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Table 2: MR imaging diagnosis of meningitis with respect to time^{^a}
Time from Presentation to MR Imaging No. of Patients Sensitivity Specificity PPV NPV Accuracy
1 day 37 82.6% (61.2%–95.1%) 92.9% (66.1%–99.8%) 95.0% (74.0%–99.2%) 76.5% (56.9%–88.9%) 86.5% (71.2%–95.5%)
3 days 69 80.0% (66.3%–90.0%) 94.4% (72.7%–99.9%) 97.6% (85.6%–99.6%) 63.0% (49.1%–75.0%) 83.8% (72.9%–91.6%)
7 days 108 83.5% (73.9%–90.7%) 95.7% (78.1%–99.9%) 98.6% (91.2%–99.8%) 61.1% (49.0%–72.2%) 86.1% (78.1%–92.0%)
10 days 119 80.7% (71.2%–88.1%) 92.3% (74.9%–99.1%) 97.4% (90.8%–99.3%) 57.1% (46.5%–67.2%) 83.2% (75.2%–89.4%)
14 days 157 75.8% (67.4%–82.9%) 93.1% (77.23%–99.2%) 98.0% (92.7%–99.5%) 46.6% (38.7%–54.6%) 79.0% (71.8%–85.1%)
21 days 197 70.5% (62.9%–77.3%) 93.6% (78.6%–99.2%) 98.3% (93.9%–99.6%) 37.2% (31.5%–43.2%) 74.1% (67.4%–80.1%)
30 days 209 67.4% (60.0%–74.2%) 93.6% (75.6%–99.2%) 98.4% (94.0%–99.6%) 33.3% (28.4%–38.6%) 71.3% (64.7%–77.3%)
Note:—True positives/True negatives for each time frame as follows: 1 day (19/13), 3 days (41/17), 7 days (71/22), 10 days (75/24), 14 days (97/27), 21 days (117/29), 30 days (178/29).
↵a Numbers in parentheses are 95% confidence intervals.