---
title: Effect of Phosphate Exposure on Workers Health
nct_id: NCT05094076
overall_status: UNKNOWN
sponsor: Assiut University
study_type: OBSERVATIONAL
primary_condition: Work-related Illness
canonical_url: "https://parkinsonspathways.com/agent/trials/NCT05094076.md"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT05094076"
ct_last_update_post_date: 2021-10-26
last_seen_at: "2026-05-12T06:01:48.085Z"
source: ClinicalTrials.gov (mirrored, no enrichment)
---
# Effect of Phosphate Exposure on Workers Health

**Official Title:** Effect of Phosphate Exposure on Workers Respiratory and Oral Health in Phosphate Mine at Safaga

**NCT ID:** [NCT05094076](https://clinicaltrials.gov/study/NCT05094076)

## Key Facts

- **Status:** UNKNOWN
- **Study Type:** OBSERVATIONAL
- **Target Enrollment:** 100
- **Lead Sponsor:** Assiut University
- **Conditions:** Work-related Illness
- **Start Date:** 2022-01-01
- **Completion Date:** 2023-12-30
- **CT.gov Last Update:** 2021-10-26

## Brief Summary

To minimize negative health effects on health of workers in phosphate mining, it is important to assess, and diagnose health related effect of phosphate exposure \& health hazards related to miners. Early reporting, diagnosis, and intervention can limit the severity of health hazards, improve the health services. To our knowledge no local previous studies were done in this area.

## Detailed Description

Mining continues to be a dangerous activity, whether large-scale industrial mining or small-scale artisanal mining. Not only are there accidents, but exposure to dust and toxins, along with stress from the working environment or managerial pressures, give rise to a range of diseases that affect miners. Beneficiation is the process of removing the unnecessary minerals, which is used to increase the grade of mining product (concentrate). Phosphate ores can be beneficiated using one or a combination of different methods. The most common ones are: flotation, crushing, desliming, separation, grinding and washing thus keeping workers in Phosphate mines employ exposed to respirable dust pollution and to high silica dust levels presented in silicosis in many job areas, Silicosis is the most common occupational lung disease in Egypt where its prevalence rate ranges from 18.5 % to 45.8% among workers exposed to free crystalline silica dust. Despite its high prevalence, there is a lack of enforcement of exposure limits, availability and use of personal protective equipment, and occupational health education programs .

In Egyptian phosphate miners' study (2011), The study involved of three groups: 50 silica-exposed workers with radiological evidence of silicosis, 50 silica-exposed workers without evidence of silicosis, and 50 healthy unexposed subjects. , There were significant differences between pulmonary function parameters, values of C-reactive protein, rheumatoid factor, complement component C3, IgA, IgG, and IgM in exposed groups with and without silicosis, and healthy unexposed control subjects (p\<.001).

Exposure to acid fumes in the phosphate mining was significantly associated with dental erosion and deteriorated oral health status, As working in phosphate mines had 8 and 28 times the risk for developing respectively oral lesions and teeth abrasions. This supported by Tunisian 2017 on 37 workers\& 37 controls, found that frequencies of fluorosis, teeth abrasion, and oral lesions were significantly higher among the exposed group.

## Eligibility

- **Minimum age:** 25 Years
- **Maximum age:** 60 Years
- **Sex:** MALE
- **Healthy Volunteers:** Yes

```
Inclusion Criteria:

* Active working miners working in phosphate mines with minimum exposure 5 year.
* Had free pre-employment records.

Exclusion Criteria:

* Workers don't record phosphate exposure as in administration department.
* Workers with less than 5-year exposure
* Workers known to had autoimmune disorder before joining job.
```

## Interventions

- **chest x ray** (RADIATION) — The chest radiographs obtained will be classified according to the International Labor Organization (ILO) System for Classification of Radiographs for Pneumoconiosis \[ILO, 1980\]. Film quality, profusion, and shape and size of opacities will be evaluated by this method. Radiographic evidence of silicosis was defined as a profusion score of 1/0 or greater

## Primary Outcomes

- **pneumoconiosis or not** _(time frame: through study completion, an average of 1 year)_ — The chest radiographs obtained will be classified according to the International Labor Organization (ILO) System for Classification of Radiographs for Pneumoconiosis \[ILO, 1980\]. Film quality, profusion, and shape and size of opacities will be evaluated by this method. Radiographic evidence of silicosis was defined as a profusion score of 1/0 or greater

## Secondary Outcomes

- **dental caries** _(time frame: through study completion, an average of 1 year)_

## Recent Field Changes (last 30 days)

- `status.overallStatus` — added _(2026-05-12)_
- `status.primaryCompletionDate` — added _(2026-05-12)_
- `status.completionDate` — added _(2026-05-12)_
- `status.lastUpdatePostDate` — added _(2026-05-12)_
- `design.enrollmentCount` — added _(2026-05-12)_
- `eligibility.criteria` — added _(2026-05-12)_
- `eligibility.minAge` — added _(2026-05-12)_
- `eligibility.maxAge` — added _(2026-05-12)_
- `eligibility.sex` — added _(2026-05-12)_
- `outcomes.primary` — added _(2026-05-12)_
- `outcomes.secondary` — added _(2026-05-12)_
- `armsInterventions.interventions` — added _(2026-05-12)_
- `sponsor.lead` — added _(2026-05-12)_
- `results.hasResults` — added _(2026-05-12)_

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