Table 3.

The association between pain severity scores and functional interference

Items	Pain average score			P value
	<4 Mean ± SD	4–7 Mean ± SD	>7 Mean ± SD
Physical function
General activity	2.0 ± 2.40	4.6 ± 2.97	6.8 ± 3.04	<0.0001
Walking ability	1.8 ± 2.54	3.9 ± 3.12	5.5 ± 3.54	<0.0001
Normal work	2.1 ± 2.74	4.4 ± 3.29	6.1 ± 3.62	<0.0001
Psychological function
Mood	2.1 ± 2.38	4.5 ± 2.81	6.3 ± 2.79	<0.0001
Relations with people	1.6 ± 2.44	3.3 ± 3.07	4.7 ± 3.64	<0.0001
Sleep	2.2 ± 2.63	4.3 ± 3.11	6.7 ± 3.30	<0.0001
Enjoyment of life	2.2 ± 2.75	4.4 ± 3.03	6.9 ± 2.85	<0.0001

SD, standard deviation.