Table 4 The studies evaluating the frequency of clinically important abnormalities on head MRI in neurologically normal participants of research protocols.
Study & Year | No. of participants (male/female) | Mean age (range) | MRI results | |||
|---|---|---|---|---|---|---|
No referral* | Routine referral | Urgent referral | Immediate referral | |||
Yue NC, et al. (1997) (1) | 3672 | > 65 | 3608 (98.3 %) | 64 (1.7 %) | ||
Katzman GL, et al. (1999) (2) | 1000 (546/454) | 30.6 (3–83) | 971 (97.1 %) | 18 (1.8 %) | 11 (1.1 %) | 0 (0 %) |
Kim BS, et al. (2002) (3) | 225 (100/125) | 11.2 (0–18) | 206 (91.6 %) | 17 (8 %) | 1 (< 1 %) | 0 (0 %) |
Illes J, et al. (2004) (14) | 151 (82/69) | 47.1 (18–90) | 141 (93.4 %) | 7 (4.6 %) | 3 (2.0 %) | 0 (0 %) |