Table 3.
Number of terms with respect to type of structured queries.
| Type of query | Number of terms, median (IQR) | Distribution of termsa within each type of query, n (%) | |||||
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≥1 population term | ≥1 intervention term | ≥1 etiology term | ≥1 diagnostic term | ≥1 outcome term | |
| Background (n=393) | 2 (1-3) | 280 (71.2) | 97 (24.7) | 4 (1.0) | 24 (6.1) | 10 (2.5) | |
| Foreground |
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|
|
|
|
|
|
|
|
All foreground (n=302) | 4 (3-5) | 224 (74.2) | 222 (73.5) | 23 (7.6) | 49 (16.2) | 65 (21.5) |
|
|
Intervention (n=213) | 3 (3-5) | 173 (81.2) | 210 (98.6) | 1 (0.5) | 2 (0.9) | 43 (20.2) |
|
|
Diagnostic (n=48) | 4 (2-5) | 24 (50) | 6 (13) | 0 (0) | 46 (96) | 0 (0) |
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|
Etiology (n=24) | 4 (3-5) | 12 (50) | 2 (8) | 22 (92) | 0 (0) | 17 (71) |
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|
Prognostic (n=17) | 5 (4-5) | 15 (88) | 4 (24) | 0 (0) | 1 (6) | 5 (29) |
| Total structured queries (n=695) | 3 (2-4) | 504 (72.5) | 319 (45.9) | 27 (3.9) | 73 (10.5) | 75 (10.8) | |
aThe distribution of terms is significantly different between background and foreground queries (P<.001). No query included the comparator search term in either type of query, so we did not include a column for the comparator term.