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| Subgroup | Serum ferritin of <20 ng/ml, N (%) | Serum ferritin of >20 ng/ml, N (%) | P-value |
| Androgenetic alopecia | 17 (68%) | 8 (32%) | 0.012 |
| Total cases of telogen effluvium | 16 (55.2%) | 13 (44.8%) | 0.990 |
| Chronic telogen effluvium | 7 (77.8%) | 2 (22.2%) | 0.031 |
| Acute telogen effluvium | 9 (45%) | 11 (55%) | 0.558 |
| Alopecia areata | 30 (65.2%) | 16 (34.8%) | 0.002 |
