FGFR2 and carpal tunnel syndrome: Connective tissue cell FGFR2 expression was also significantly higher in control samples (20.20% ± 10.49%) compared to CTS samples (9.10% ± 2.08%; p = 0.044; d = 1.468), and it was significantly lower compared to both DUF (45.20% ± 11.40%; p = 0.0004; d = 2.282) and DAF samples (33.10% ± 8.57%; p = 0.044; d = 1.347).