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| Onset season | Number of cases (%) | Levels of 25-hydroxyvitamin D3 (ng/mL) | F value | P |
|---|---|---|---|---|
| Spring | 125 (20.66%) | 13.374* | 5.807 | 0.000 |
| Summer | 109 (18.17%) | 17.625 | ||
| Autumn | 181 (29.92%) | 16.740 | ||
| Winter | 190 (31.40%) | 14.393* |
The Tukey test was used for comparisons between groups; *, indicates P<0.05, compared to the summer and autumn groups. The population variances for each group were equal.
