Illness perceptions; exploring mediators and/or moderators in disabling persistent low back pain. Multiple baseline single-case experimental design

Table 8 Final linear mixed model effects for IPs as moderator for Primary Outcomes with Study phase A as reference class, adjusted for co-variates

	Pain Intensity				Physical functioning				Pain interference daily life
	During Treatment		Post Treatment		During Treatment		Post Treatment		During Treatment		Post Treatment
Illness Perception	TE	CI	TE	CI	TE	CI	TE	CI	TE	CI	TE	CI
Personal control
Low baseline score (0–7) n = 140	−2.1^a	−2.9 / -1.2	−2.7^a	−3.5 / -1.8	−2.1^a	−2.9 / -1.2	−3.3^a	−4.2 / −2.6	-2.1^a	− 3.0 / -1.3	− 3.7^a	−4.5 / -2.8
High baseline score (8–10) n = 56	−0.8	−1.5 / -0.1	−1.3	− 2.0 / -0.5	−1.3	− 2.0 / -0.7	−2.1^a	− 2.8 / -1.4	−0.8	− 1.5 / -0.1	− 1.6	−2.3 / -0.9
Treatment control
Low baseline score (0–4) n = 127					−2.1^a	− 2.8 / -1.4	−2.9^a	− 3.6 / -2.2
High baseline score (5–10) n = 69					−1.0	−1.8 / -0.2	−2.3^a	−3.1 / -1.5
Identity
Low baseline score (0–8) n = 144									−2.0^a	−2.8 / -1.2	2.8^a	−3.6 / -2.0
High baseline score (9–10) n = 52									−0.7	−1.5 / 0.1	2.1^a	−3.0 / − 1.3
Concern
Low baseline score (0–8) n = 153									-1.8^a	−2.5 / -1.0	2.6^a	−3.2 / -1.9
High baseline score (9–10) n = 43									−0.8	−1.6 / 0.1	2.3^a	−3.2 / -1.4
Emotional response
Low baseline score (0–8) n = 145									−2.0^a	−2.8 / -1.2	2.8^a	−3.6 / 2.0
High baseline score (9–10) n = 51									−0.7	−1.5 / 0.1	2.1^a	−3.0 / -1.3

A = pre-treatment, B = during treatment, A’ = post-treatment, TE = Total Effect, All outcome = P < .01, ^a = Clinical meaningful improvement ≥ 30% baseline score [32].

ISSN: 1471-2474