Table 4. Comparison of presence of current pressure ulcers and utility score between those using foam cushions and those using air-filled cushions.

Cushion	N	Current pressure ulcers		Utility scores
		With	Without	Mean	s.d.
Foam	101	24	77	0.032	0.186
Air-filled	20	5	15	0.131	0.224
		P=1.000a		P=0.089b

Note: The utility score was calculated by using the Thai algorithm based on the EQ-5D health states.

^aFisher's exact test.

^bKruskal–Wallis test.