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| Simpson | n | Mean | SD | SE | 95% CI for mean | Minimum | Maximum | |
|---|---|---|---|---|---|---|---|---|
| Lower limit | Upper limit | |||||||
| Grade I | 26 | 3.680 | 3.541 | 0.694 | 2.319 | 5.042 | 1 | 12 |
| Grade II | 13 | 6.692 | 4.661 | 1.292 | 4.16 | 9.226 | 1 | 14 |
| Grade III | 2 | 8.5 | 4.949 | 6.010 | -3.28 | 20.28 | 5 | 12 |
SD = standard deviation; SE = standard error; 95% CI = 95% confidence interval
