Table 4

Mixed model repeated measure linear regression showing the association between NT-proBNP (dependent variable) and markers of disease activity and treatment


Adjusted linear regression (CI)
Multivariate linear regression (CI)


β coefficients (CI)
P value
β coefficients (CI)
P value

Age
1.03 (1.02–1.03)
< 0.001
1.02 (1.01–1.02)
< 0.001
Male gender
0.81 (0.64–1.01)
0.06
0.12 (0.05–0.26)
< 0.001
C-reactive proteina
1.01 (1.01–1.02)
< 0.001
1.01 (1.01–1.02)
< 0.001
HAQa
1.12 (1.00–1.27)
0.06


Prednisolonea, b
1.20 (1.03–1.41)
0.02


NSAIDa, b
0.90 (0.79–1.04)
0.14


DMARDa, b
0.95 (0.83–1.09)
0.49


Sharp scorea
1.01 (1.00–1.01)
0.001


Ritchie scorea
1.01 (1.00–1.02)
0.01


Time
1.04 (1.03–1.06)
< 0.001
1.03 (1.02–1.05)
< 0.001
Time × male gender


1.04 (1.01–1.07)
0.01
Age × male gender


1.03 (1.02–1.05)
0.01

aAge- and gender-adjusted; bdichotomized variable. CI, confidence interval; DMARD, disease-modifying anti-rheumatic drug; HAQ, Stanford Health Assessment Questionnaire; NSAID, non-steroidal anti-inflammatory drug; NT-proBNP, N-terminal pro-brain natriuretic peptide; Ritchie score, Ritchie articular index; Sharp score, van der Heijde modified Sharp criteria.

Provan et al. Arthritis Research & Therapy 2008 10:R70   doi:10.1186/ar2442