Table 2.

Item descriptive statistics.

	Day 1			Day 8
Item	Missing (%)	Mean	SD	Missing (%)	Mean	SD
Pain intensity	0.0	0.95	1.07	0.0	0.63	0.96
Personal care	0.0	0.72	0.94	0.0	0.55	0.88
Lifting	10.8	1.81	1.84	10.8	1.60	1.66
Reading	9.2	1.51	1.42	9.2	1.22	1.35
Headaches	0.0	1.83	1.51	0.0	1.66	1.33
Concentration	0.0	0.94	1.34	0.0	0.77	1.01
Work	0.0	1.23	1.33	0.0	0.97	1.14
Driving	44.6	1.08	1.32	44.6	0.89	1.09
Sleeping	0.0	1.58	1.71	0.0	1.63	1.67
Recreation	1.5	0.97	1.25	1.5	0.86	1.23