Table 6.

Association of risk factors with shoulder ulcers

	Presence of shoulder ulcers (any score ≥ 1) n (%)	Absence of shoulder ulcers n (%)	Odds Ratio (95% Confidence Interval)	p-value
Subgroup without rubber mat (n = 566)
At-risk group	63 (62.4)	38 (37.6)	5.55 (3.51, 8.76)	<.0001
Non-at-risk group	107 (23.0)	358 (77.0)	1.0 (Ref.a)
Subgroup under risk (n = 194)
Rubber mat group	44 (47.3)	49 (52.7)	0.54 (0.31, 0.96)	0.0358
No rubber mat group	63 (62.4)	38 (37.6)	1.0 (Ref.a)

^aRef. = Reference group