The Mn-CEI of the Guangxi manganese-exposed workers healthy cohort (GXMEWHC)
| Mn-CEI (mg/m3 year) | Number (n) | Per cent | Median (IQR) | Range |
|---|---|---|---|---|
| Internal control group (Mn-CEI<1.0) | 651 | 34.5 | 0.51 (0.55) | 0.01–0.99 |
| Low exposure group (1.0≤Mn-CEI < 2.0) | 333 | 17.6 | 1.49 (0.46) | 1.01–1.99 |
| Medium exposure group (2.0≤Mn-CEI < 5.0) | 710 | 37.6 | 3.04 (1.20) | 2.00–4.98 |
| High exposure group (Mn-CEI≥5.0) | 194 | 10.3 | 5.99 (2.47) | 5.01–9.77 |
| Total | 1888 | 100 | 1.85 (2.58) | 0.01–9.77 |
Mn-CEI, manganese cumulative exposure index.