A Study of IL-1β, MMP-3, TGF-β1, and GDF5 Polymorphisms and Their Association with Primary Frozen Shoulder in a Chinese Han Population

Table 2

Characteristics of the study population in patients with PFS and controls.

Characteristics	Cases; ()	Controls; ()	value
Male/female	20/22	23/27	0.877
Age (years)	53.86 ± 1.60	54.80 ± 2.58	0.175
BMI (kg/m^2)	23.15 ± 1.00	23.31 ± 1.14	0.481

BMI: body mass index; PFS: primary frozen shoulder.