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Two-way classification ANOVA for examining the effect of HLA-B27 status and gender on age at disease onset
| Age at disease onset (years) | P value | |
|---|---|---|
| HLA-B27positivity | 29.9±13.1 | 0.042 |
| HLA-B27 negativity | 34.5±12.1 | 0.042 |
| Male gender | 28.5±13.0 | <0.001 |
| Female gender | 35.4±11.9 | <0.001 |
ANOVA, analysis of variance; HLA-B27, human leucocyte antigen B27
