Table 3.

External construct validity of items on the German BQN.

BQ SCALE	NPAD Pre- Treatment (r)	NPAD Post-Treatment (r)	NDI Pre-Treatment (r)	NDI Post-Treatment (r)
Pain	.61	.72	.59	.65
Physical Function	.48	.56	.40	.51
Social Function	.72	.65	.67	.65
Anxiety	.55	.71	.58	.60
Depression	.52	.80
Work-related fear avoidance	.66	.64
Pain Control	.24	.45
Total Score	.69	.80	.68	.76

All are significant (p < 0.05).