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Table 3 Mixed model for repeated measurements

From: Pelvic joint fusion in patients with severe pelvic girdle pain – a prospective single-subject research design study

  Pre-operative score constant value (95% CI) Regression coefficient (95% CI) Score at 1-year follow-up
ODI 54.2 (48.4-59.9) -5.7 (-7.6- -3.8) p < 0.001 37.1
VAS in the morning 59.5 (45.6-73.5) -4.8 (-9.0- -0.7) p = 0.019 45.1
VAS in the evening 81.7 (76.3-87.2) -8.4 (-12.3- -4.5) p < 0.001 56.5
SF-36       
Physical functioning 21.5 (8.8-34.3) 7.0 (3.2-10.8) p < 0.001 42.5
Role physical 2.8 (-6.7-12.3) 2.6 (-1.1-6.3) p = 0.169 10.6
Bodily pain 13.1 (4.7-21.6) 6.8 (4.2-9.4) p < 0.001 33.5
General health 48.4 (34.9-61.9) 2.0 (0.5-3.5) p = 0.009 54.4
Vitality 42.8 (33.3-52.4) 1.5 (-0.7-3.6) p = 0.174 47.3
Sosial functioning 41.8 (22.4-61.2) 5.2 (1.3-9.0) p = 0.008 57.4
Role emotional 55.1 (24.8-86.2) 2.6 (-1.7-7.0) p = 0.240 62.9
Mental health 75.1 (64.1-86.1) -1.0 (-2.7-0.7) p = 0.224 72.1
  1. ODI, VAS and individual items of SF-36 as dependent variables and time as independent variable. Regression line: constant + regression coefficient × time (time is defined as; 0 = baseline, 1 = 3 months, 2 = 6 months, 3 = 12 months). Score at 1-year follow-up = constant value at baseline + 3 times regression coefficient.