Table 2.

Association between obesity and pressure ulcers among newly admitted NH residents who became long-stayers

		Mild obesity (30<=BMI<35 kg/m2 )	Moderate or severe obesity (BMI>= 35 kg/m2 )
Pooled analysis	Overall difference (logit model)	1.032 *** [1.020–1.045]	1.158*** [1.142–1.174]
	Within-facility difference (conditional fixed-effects logit model)	1.029 *** [1.017–1.041]	1.150*** [1.134–1.166]
Stratified analysis	CNA level <=1.76 hours per resident per day (conditional fixed-effects logit model)	1.045*** [1.019–1.072]	1. 189*** [1.155–1.225]
	1.76< CNA level <2.52 hours per resident per day (conditional fixed-effects logit model)	1.023*** [1.006–1.039]	1.140*** [1.119–1.162]
	CNA level >=2.52 hours per resident per day (conditional fixed-effects logit model)	1.033** [1.006–1.060]	1.128*** [1.092–1.165]

All the variables listed in Table 1 as well as secular time trends were included in the analyses as control variables but results not shown in this table ( details are available in Appendix-1).

The numbers in the cells indicate odds ratios of having pressure ulcers among obese residents relative to non-obese residents (i.e. non-obese residents serve as the reference group). The numbers in the parentheses represent 95% confidence intervals.

The effects of moderate or severe obesity on pressure ulcers are statistically significant across the three strata (i.e. odds ratio of 1.189, 1.140 and 1.128) with P value < 0.05.

^**P<0.05

^***P<0.01