Subacute and chronic, non-specific back and neck pain: cognitive-behavioural rehabilitation versus primary care. A randomized controlled trial

Table 3 Missing data.

Follow-up	Six months	p-value	12 months	p-value	18 months*	All forms	p-value
Rehabilitation group (n = 61)
Previous sick-listing (days)**	397 vs. 215	.008	371 vs. 214	.01	-	-
Current sick-listing at baseline (days)	367 vs. 158	< .001	346 vs. 156	< .001	-	275 vs. 151	.003
Unemployment (%)	-	-	60 vs. 18	.03	-	-
Primary-care group (n = 62)
Age (years)	35.8 vs. 44.8	.006	-		-	38.3 vs. 45.3	.01
Single (%)	58 vs. 28	.046	-		-	-
EQ-5D [49]	-	-	.357 vs. .562	.046	-	-

Non-responders versus responders. Significant differences at baseline. Descriptive statistics.
*At 18 months there were no significant differences.
** = Net days over the 18 months preceding baseline.