Table 4.

Zero-Inflated Poisson Regression Coefficients for the Odds of Nonparticipation (Inflate) and the Number of Exercises (Count), U.S. Adults Ages 25–60, National Health Interview Survey 1998

	Model 1: Team		Model 2: Fitness		Model 3: Facilities
Variable	Inflate	Count	Inflate	Count	Inflate	Count
Education	–.112** (.041)	–.024 (.026)	–.138*** (.016)	.048*** (.004)	–.277** (.100)	.060*** (.014)
Race-ethnicity (reference non-Hispanic white)
Non-Hispanic black	–.488** (.174)	.189 (.110)	–.113 (.117)	.116** (.036)	1.561* (.703)	–.328 (.320)
Mexican American	–1.056** (.467)	–.347 (.233)	.419* (.170)	.042 (.068)	.511 (.916)	–.559 (.315)
Sociodemographic variables
Male (reference female)	-1.436*** (.193)	.335* (.155)	.422*** (.072)	–.014 (.020)	–1.478** (.472)	.439*** (.107)
Age/10, squared	.113*** (.011)	–.003 (.007)	–.008 (.005)	–.018*** (.001)	.028 (.031)	–.018*** (.005)
Region (reference Northeast)
Midwest	–.382 (.202)	–.085 (.131)	.071 (.112)	–.030 (.029)	–.154 (.637)	.060 (.122)
South	–.328 (.213)	–.169 (.152)	.256* (.106)	–.087** (.032)	–.268 (.587)	.242* (.116)
West	–.290 (.226)	–.024 (.155)	–.255 (.130)	.082** (.028)	–1.610* (.718)	.047 (.123)
Interview quarter (reference quarter 1)
Quarter 2	–.262 (.213)	.097 (.133)	–.074 (.106)	–.025 (.026)	–.465 (.871)	.838*** (.159)
Quarter 3	.049 (.226)	.209 (.152)	.050 (.110)	–.042 (.029)	–1.290 (1.437)	.989*** (.205)
Quarter 4	.280 (.210)	.087 (.146)	.186 (.115)	–.117*** (.032)	1.489 (.996)	.559*** (.161)
Family income equivalence	–.182 (.122)	–.052 (.082)	–.097 (.051)	.080*** (.017)	–.338 (.188)	.222*** (.057)
Employed (reference not employed)	–.393 (.413)	–.136 (.369)	1.119*** (.210)	.054 (.041)	.632 (.586)	–.141 (.151)
Income portfolio	-.071 (.082)	.019 (.050)	–.385*** (.045)	.070*** (.012)	–.524 (.311)	.133*** (.038)
Constant	3.122*** (.615)	–.201 (.496)	.331 (.302)	–.180* (.088)	4.375*** (1.166)	-4.112*** (.381)

Note: Standard errors in parentheses.

^***p ≤ 0.001

^**p ≤ 0.01

^*p ≤ 0.05.