Table 3.
Distribution of type and grade of Skeletal fluorosis (SF) detected among children in a coal-burning endemic fluorosis area, Zhijin, Guizhou, China, 2004.
| Boys | Girls | Total | |
|---|---|---|---|
| n (%) | n (%) | n (%) | |
| Type of SF | |||
| Constrictive type | 46 (37.7) | 28 (23.0) | 74 (60.7) |
| Raritas type | 9 (7.4) | 10 (8.2) | 19 (15.6) |
| Mixed type | 8 (6.6) | 12 (9.8) | 20 (16.4) |
| Soft type | 7 (5.7) | 2 (1.6) | 9 (7.4) |
|
| |||
| Total | 70 (57.4) | 52 (42.6)§ | 122 (100.0) |
|
| |||
| Grade of SF | |||
| Mild | 28 (23.0) | 26 (21.3) | 54 (44.3) |
| Moderate | 34 (27.9) | 23 (18.8) | 57 (46.7) |
| Severe | 8 (6.6) | 3 (2.5) | 11 (9.0) |
|
| |||
| Total | 70 (57.4) | 52 (42.6)† | 122 (100.0) |
§Type of SF does not differ by gender (χ 2 = 5.472, df = 3; P = .140).
†Grade of SF does not differ by gender (χ 2 = 1.854, df = 2; P = .396).