Long-term effectiveness and costs of a brief self-management intervention in women with pregnancy-related low back pain after delivery

Table 3 Longitudinal analyses for main linear mixed models (n-114). Parameter estimates and CI intervals for treatment effects in outcomes, after experimental intervention compared to usual care

Outcome measure	Estimated regression coefficient {95% CI } P-value (two-tailed)
*Primary outcomes*
RDQ (0–24)	-1.6 {-2.9;-0.5} 0.005
MC (VAS) * (0–100)	-4.9 {-10.3;0.4} 0.07
Secondary outcomes
VAS (pain today) (0–100)	-1.4 {-6.6;3.8} 0.58
VAS (pain this week) (0–100)	-3.6 {-9.3;2.0} 0.20
*Secondary outcomes*
IPA:
Autonomy in self-care (0–28)	-1.0 {-1.9;-0.03} 0.04
Mobility and leisure (0–20)	-0.4 {-1.3;0.5} 0.40
Family role (0–28)	-0.7 {-1.9;0.5} 0.27
Social relationships (0–24)	-0.3 {-0.8;0.2} 0.23
TSK:
Total score (17–68)	-2.4 {-3.8;-1.1} 0.00
Activity Avoidance (8–32) ^‡	-1.7 { -2.6;-0.8} 0.00
Harm (5–20) ^†	-0.3 {-0.8;0.2} 0.23
SF-36:
General Health (0–100)	-0.7 {-3.3;1.8} 0.57
EuroQol (0–1)	-0.005 {-0.04;0.03} 0.87
Subgroup RDQ < 13
TSK (total) (17–68)	-1,9 {-3.6;-0.15} 0.03
Activity Avoidance (8–32)(TSK-subscale)	-1.3 {-2.3;-0.3} 0.02
Subgroup RDQ ≥ 13
RDQ (0–24)	-1.8 {-3.4:-0.14} 0.03
Autonomy in self-care (0–28)(IPA subscale)	-1.7 {-3.0;-0.4} 0.01
Activity Avoidance (8–32)(TSK subscale)	-1.5 {-2.7;-0.3} 0.01

First main complaint was selected, ^‡ TSK subscale Activity Avoidance (items 1,2, 9,10, 13, 14, 15, 17),
^† TSK subscale Harm (items 3, 5, 6, 7, 11).
RDQ = Roland Disability Questionnaire, MC = Main Complaint, VAS = Visual Analog rating Scale, IPA = Impact on Participation and Autonomy, TSK = Tama Scale for Kinesiophobia, SF-36 = Short Form-36.