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Number of excimer laser refractive surgery centers and the number of sampled centers in the 12 surveyed provinces of this study.
| Province name | Number of selected centers | Number of active centers | Sampling weight |
|---|---|---|---|
| West Azerbaijan | 1 | 1 | 1 |
| Isfahan | 5 | 7 | 1.4 |
| Khuzestan | 1 | 3 | 3 |
| East Azerbaijan | 3 | 3 | 1 |
| Tehran | 8 | 24 | 3 |
| Gilan | 1 | 1 | 1 |
| Sistan and Baluchistan | 2 | 2 | 1 |
| Fars | 2 | 7 | 3.5 |
| Qazvin | 1 | 1 | 1 |
| Qom | 1 | 2 | 2 |
| Kermanshah | 1 | 1 | 1 |
| Khorasan Razavi | 2 | 5 | 2.5 |
