Reported symptoms by scanner category*
| Reporting of at least one symptom within the specified category (nobs(%)) | |||||||
|---|---|---|---|---|---|---|---|
| Scanner category | Overall nobs | SMF target symptoms (%) | SMF target—core symptoms (%) | A priori unrelated symptoms (%) | |||
| Unexposed | 134 | 25 | (19) | 1 | (1) | 4 | (3) |
| 1.5 T closed bore† | 259 | 72 | (28) | 14 | (5) | 17 | (7) |
| 3 T closed bore‡ | 131 | 46 | (35) | 12 | (9) | 3 | (2) |
| 7 T closed bore§ | 31 | 12 | (39) | 9 | (29) | 0 | (0) |
| <1.5 T various types¶ | 49 | 13 | (27) | 2 | (4) | 7 | (14) |
| >4.7 T small bore** | 57 | 9 | (16) | 0 | (0) | 4 | (7) |
| Overall | 619 | 162 | (26) | 35 | (6) | 33 | (5) |
*Scanner category was missing for 14 of the 633 observations, resulting in 619 valid observations. One shift can satisfy more than one scanner category; therefore, the sum of observations exceeds the total number of 619 observations. Results are based on an unbalanced study sampling design with repeated measures per subject.
†Includes all large-bore cylindrical systems of 1.5 Tesla.
‡Includes all large-bore cylindrical systems of 3.0 Tesla.
§Includes all large-bore cylindrical systems of 7.0 Tesla.
¶Includes extremity scanners, upright scanners and open (ie, transversal field) scanners up to 1.5 Tesla and large-bore cylindrical systems below 1.5 Tesla.
**Includes small-bore cylindrical animal scanners with field strengths between 4.7 and 11.7 Tesla.
Nobs, number of observations; SMF, static magnetic field; T, Tesla.