Development and validation of the ND10 to measure neck-related functional disability

Table 4 Convergent validity: comparing the ND10 with related measures

Comparative measure	Time 1 (n)	Time 2 (n)	ND10- Time 1	ND10- Time 2
NDI	78	36	0.90^*	0.86^**
NDI-5	73	35	0.91**	0.90**
NDI-5 T	70	34	0.87	0.85
QDASH	51	30	0.89^**	0.87^**
SANE	51	30	-0.51^**	-0.36^*

NDI Neck Disability Index, NDI-5 is the raw NDI-5 score and T is the score transformed based on the Rasch model; QDASH Quick DASH, SANE Single alphanumeric (Neck) evaluation, n number of participants completing measure, statistical significance *p < 0.05, ** p < 0.01

ISSN: 1471-2474