Table 3.

Ahlbäck grade and HSS score

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