Mazzotti 1939.
| Methods |
FLUOROSIS STUDY Country of study: Mexico Geographic location: all areas in Mexico, 11 states, 107 cities Year of study: 1938 Year of change in fluoridation status: NA Study design: cross‐sectional |
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| Participants | Inclusion criteria: not stated Exclusion criteria: not stated Other sources of fluoride: not stated Social class: not stated Ethnicity: not stated Residential history: not stated Other confounding factors: not stated |
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| Interventions | Groups: 0‐4 unclear ppm | |
| Outcomes | Dental fluorosis (index unclear) Age at assessment: not stated |
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| Funding | Not stated | |
| Notes | Paper translated from Spanish | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Sampling | Unclear risk | There was insufficient detail reported to determine how selection took place |
| Confounding | High risk | No details were reported on SES or fluoride from other sources |
| Blinding of outcome assessment (detection bias) All outcomes | High risk | Insufficient information |
| Incomplete outcome data (attrition bias) All outcomes | Unclear risk | Insufficient information to determine whether there was attrition |
| Selective reporting (reporting bias) | High risk | Data not in suitable format for analysis |
| Other bias | Unclear risk | Overall reporting on any information too poor to permit thorough assessment of any risk of bias |