Ahlbäck grade | N | Mean HSS | SD | Standard Error Mean | 95% confidence interval for mean | Min | Max | |
---|---|---|---|---|---|---|---|---|
Lower limit | Upper limit | |||||||
I | 243 | 56.91 | 10.750 | 0.690 | 55.55 | 58.27 | 32 | 82 |
II | 358 | 55.64 | 12.019 | 0.635 | 54.39 | 56.89 | 22 | 95 |
III | 416 | 51.86 | 12.966 | 0.636 | 50.61 | 53.11 | 3 | 95 |
IV | 241 | 49.44 | 12.699 | 0.818 | 47.83 | 51.05 | 18 | 94 |
V | 71 | 47.35 | 12.322 | 1.462 | 44.44 | 50.27 | 12 | 73 |
Total | 1329 | 53.12 | 12.596 | 0.346 | 52.44 | 53.80 | 3 | 95 |