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Descriptives of Categorical Variables and Chi-square Tests Based on Risk of Grade Retention
| Percent | χ2 | p | |
|---|---|---|---|
| Grade Retention | |||
| Yes | 19.2% | ||
| No | 80.8% | ||
| Sex | |||
| Female | 45.7% | 2.1 | 0.15 |
| Male | 54.3% | ||
| Sickle cell type | |||
| HbSS or HbS/β0 | 63.0% | 0.6 | 0.42 |
| HbSC or HbS/β+ | 37.0% | ||
| SCD Pain | |||
| Yes | 26.9% | 2.1 | 0.14 |
| No | 73.1% | ||
| Stroke | |||
| Yes | 23.9% | 0.1 | 0.76 |
| No | 76.1% |
Note: Degrees of freedom for all chi-squares were 1.
p < 0.05.
p < 0.01.
