From: Development of new measurement system of thoracic excursion with biofeedback: reliability and validity
Evaluator
A
B
C
BREATH (cm)
3.46 ± 0.51
4.05 ± 0.44
4.14 ± 0.57
Tape measure (cm)
5.68 ± 0.51
5.44 ± 0.49
5.47 ± 0.62