Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Comparison of Raven’s SPM grades between children with and without fluorosis
| Fluorosis | Total | |||
|---|---|---|---|---|
| No | Yes | |||
| Raven’s SPM Grade | 1 (intellectually superior) | 6 (10%) | 0 (0%) | 6 |
| 2 (above average) | 12 (20%) | 9 (15%) | 21 | |
| 3 (intellectually average) | 33 (55%) | 33 (55%) | 66 | |
| 4 (below average) | 9 (15%) | 6 (10%) | 15 | |
| 5 (intellectually impaired) | 0 (0%) | 12 (20%) | 12 | |
| Total | 60 | 60 | 120 | |
| Chi-Square | 19.029 | P value 0.001 | ||
