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| No. of employees | 2008 | 2016 | χ2 test |
|---|---|---|---|
| No. of plants served by OPs (%) | No. of plants served by OPs (%) | p-value | |
| <50 | 39 (19.6) | 51 (12.1) | NS (2 × 6) |
| 50–99 | 77 (38.7) | 180 (42.6) | |
| 100–299 | 58 (29.1) | 125 (29.6) | |
| 300–499 | 15 (7.5) | 32 (7.6) | |
| 500–999 | 5 (2.5) | 21 (5.0) | |
| ≥1,000 | 5 (2.5) | 14 (3.3) | |
| Total | 199 (100.0) | 423 (100.0) | |
OP: occupational physician; NS: Not significant.
