Development of a Physiological Frailty Index for the World Trade Center General Responder Cohort

Table 6

Prevalence of frailty (stratified by demographic characteristics) within the study sample.

Variable	Strata	% with WTC FI-Lab ≥ 0.25	value (chi-square test)
Age group; at index visit	40–45	6.7	<0.0001
	46–50	8.5
	51–55	11.4
	56–60	16.6
	61–65	21.0
	>65	24.6
Sex	Male	12.6	0.0519
	Female	10.6
Race	White	11.3	<0.0001
	Black	17.4
	Hispanic	11.6
	Other	10.1
Pre-9/11 occupation	Construction	13.9	<0.0001
	Protective	9.8
	Other	15.8
	CM and IRG	13.3
Education	Higher than HS	11.6	0.0096
	HS or lower	13.8
Enrollment year	2002–2005	12.5	0.7717
	2006–2008	12.1
	>2008	11.9
WTC exposure severity	Low	13.2	0.5677
	Medium	12.2
	High/very high	11.8
Smoking status at index visit	Current	20.6	<0.0001
	Former	14.1
	Never	10.3
Year of index visit	2012	11.2	0.2378
	2013	11.9
	2014	12.7
	2015	14.3
	2016	14.6