Table 2.

Stratified sample—number of patients by main diagnoses, age, and sex.

Classification according to ICD-10	Number of patients		Age	Women
Localization/Main diagnosis	Abs.	%	Mean SD	Abs.	%
Back (spine)	6448	86.6%	48.84 ± 6.15	3491	54.1%
M54, M53 (M51, M50)
Knee	228	3.1%	50.38 ± 5.98	102	44.7%
M17 (M22, M23)
Hip	98	1.3%	50.65 ± 5.24	46	46.9%
M16
Shoulder	155	2.1%	49.88 ± 5.49	85	54.8%
M75
Other osteoarthritis	303	4.1%	50.29 ± 5.93	155	51.2%
M25, M15, M19 (M18)
Other	79	1.1%	48.96 ± 6.48	51	64.6%
M77, M06, M35 (M76, M79)
Other diseases (musculoskeletal system)	137	1.8%	48.81 ± 6.84	73	53.3%
ICD-10 Kat. (<n = 3)
Total	7448	100.0%	48.99 ± 6.15	4003	53.7%