A cross-sectional study was conducted in Iran to examine the working memory of students exposed to extremely low frequency magnetic fields from high-voltage transmission lines and substations.
The status of working memory in the students was determined by the digit span test and the letter-number sequencing test (Wechsler Intelligence Scale for Children).
| Group | Description |
|---|---|
| Reference group 1 | 2 schools in a distance of 610 m and 1390 m to a high-voltage substation |
| Group 2 | 2 schools in a distance of 30 m and 50 m to a high-voltage substation |
| Type | Value |
|---|---|
| Total | 176 |
74 boys in group 1 and 102 in group 2
The average magnetic flux density was 0.245 µT at the schools in a distance of 30 m and 50 m to a high-voltage substation and 0.164 µT at schools in a distance of 610 m and 1390 m.
The results showed that boys of schools in a distance of 610 m and 1390 m to a high-voltage substation had better working memory compared to boys of the schools in a distance of 30 m and 50 m.
The authors concluded that extremely low frequency magnetic field exposure may have a negative impact on the working memory of children.
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