Table 5. Body composition indices of non-arthritis controls (females n = 880, males n = 388), and the differences of these indices with early arthritis patients (females n = 220, males n = 97), stratified for gender.

	Mean values for control females	Differences for female arthritis patients, B or OR (CI) and p-value	Mean values for control males	Differences for male arthritis patients, B or OR (CI) and p-value
BMI	27.1 (4.7)	1.0 (0.26–1.70) 0.008*	27.4 (3.7)	-0.3 (-1.11–0.61) 0.573
ALMI	7.0 (0.8)	-0.3 (-0.44- -0.19) <0.001*	8.6 (1.0)	-0.6 (-0.83- -0.39) 0.001*
FMI	26.6 (4.6)	1.1 (0.38–1.78) 0.003*	27.4 (3.6)	-0.6 (-1.45–0.23) 0.154
Android to gynoid fat mass ratio	0.5 (0.2)	<0.1 (-0.04–0.00) 0.102	0.8 (0.2)	-0.1 (-0.09- -0.01) 0.029
Body fat%	39.8 (6.4)	0.9 (-0.05–1.92) 0.062	30.7 (5.5)	-0.8 (-2.07–0.47) 0.216
% of fat distributed to the trunk	49.4 (6.5)	2.8 (1.83–3.75) <0.001*	57.6 (5.6)	1.2 (-0.11–2.47) 0.074
Obese	38.4	1.3 (0.98–1.78) 0.068	58	0.8 (0.51–1.25) 0.324
Low muscle mass for age	1.3	4.2 (1.78–9.72) 0.001*	1.5	5.7 (1.94–16.91) 0.002*

Results are expressed as mean (SD) or percentages and as beta (B) or odds ratio (OR) with a 95%-confidence interval (CI) and a p-value. ALMI: appendicular lean mass index, BMI: body mass index, FMI: fat mass index, n = number, RA: rheumatoid arthritis, SD: standard deviation, %: percentages

*significant results at the 0.05 false discovery rate for 18 tests, between arthritis patients and non-arthritis controls.